Joystar 2-piece Blender Smoothie Bottle Cup review

Have you been hunting for a reliable replacement cup for your Oster Blend-N-Go or Classic Series blender that’s sturdy, spill-resistant, and easy to carry?

Overview of the Joystar 2 piece Blender Smoothie bottle cup with lid for Oster Blender Blend-N-Go Smoothie blender or Cup for Oster Classic Series blenders(2, PETG)

I bought the Joystar 2 piece Blender Smoothie bottle cup with lid for Oster Blender Blend-N-Go Smoothie blender or Cup for Oster Classic Series blenders(2, PETG) to replace a cracked travel cup and to test how well a third-party cup would fit and perform with my Oster appliances. I like products that are simple, practical, and do what they promise, and this cup positioned itself as a budget-friendly, compatible option. In my experience, it mostly delivered on those expectations, though there are a few trade-offs worth noting.

I’ll walk through everything I noticed — compatibility, build, ease of use, cleaning, and real-world performance — so you can decide if it’s right for you. I’ve tried to be detailed and honest based on repeated use for smoothies, protein shakes, and a few other blended drinks.

Quick specs and breakdown

I find a quick snapshot useful before getting into details. The table below summarizes the key specs and features I relied on when testing the product.

Feature	Specification / My Notes
Product name	Joystar 2 piece Blender Smoothie bottle cup with lid for Oster Blender Blend-N-Go Smoothie blender or Cup for Oster Classic Series blenders(2, PETG)
Material	PETG (durable, BPA-free). Feels similar to polycarbonate but lighter.
Capacity	20 oz blended capacity (fits Blend-N-Go 20 oz size)
Included pieces	2 cups with lids and straws
Compatibility	Oster Blend-N-Go, Oster Classic Series, and a long list of Oster models (see compatibility section)
Lid type	Drink-through, spill-resistant lid with durable straw
Dishwasher	Manufacturer notes it can’t be disinfected by dishwasher; I recommend hand washing
Durability	Virtually unbreakable design in daily use; not indestructible under heavy impact
BPA-free	Yes
Color / Clear	Mostly clear/translucent PETG so you can see contents
Price point	Typically budget-friendly relative to OEM cups
Use case	Smoothies, protein shakes, iced coffee, to-go drinks

I liked having two cups in the package because it meant I could cycle one through washing while using the other. The clear PETG made it easy to see residue and check if it was clean.

Compatibility with Oster blenders

Compatibility was the main reason I chose this product. I needed a cup that would securely mount to my Oster blender base and seal properly.

The manufacturer lists compatibility with many Oster models, including the Blend-N-Go and several Classic Series models. In practice I tested the cup with an Oster Blend-N-Go and it threaded securely and locked in place the way an original cup would. If you own an Oster Classic Series blender, it’s likely to fit, but I recommend checking your model number or trying the cup on your base when possible.

I appreciated that the package included two cups — that’s handy if you switch between family members or different drinks. Just be sure to confirm the thread and seal fit your specific model, as very old or unusual variants might have slightly different fittings.

Exact model list claimed compatible

The product description references several Oster models by name and number, and I list the most commonly mentioned ones here. This helps me and others match up compatibility before buying.

• Oster Heritage Blend 004242-600-NP0
• Oster Classic Series BLSTTA-C00-026
• Oster Reverse Crush BVCB07-Z00-NP0
• Oster Perform Blend series
• Oster Precise Blend (5-cup and 6-cup models)
• Oster 10-Speed Blender
• Oster Rapid Blend series
• Oster Pure Blend / Exact Blend / Accurate Blend / Simple Blend

This is not a perfect or exhaustive list and some marketing copy can be repetitive, but I found that the cup fits the modern Oster Blend-N-Go and many Classic Series bases reliably.

Design and build quality

I always check material, finish, and how everything feels when assembled. The Joystar cup impressed me in some ways and left me wanting improvements in others.

The cups are made from PETG, a strong thermoplastic that’s similar in feel to polycarbonate but typically less prone to crazing. PETG is durable and BPA-free. In my hands the cup felt solid, with a smooth finish and no sharp lip at the top where the lid screws on. The threads on both cup and lid matched cleanly, so I didn’t notice any wobble when attaching the cup to the blender or screwing on the lid.

Cosmetically, the finish is clear and utilitarian. I didn’t get any flashy styling, but I didn’t expect it either; the cup is built for function more than looks. I liked that the plastic was transparent enough to monitor contents and check for leftover residue.

Material: PETG and safety considerations

Understanding materials matters because it affects durability and safety. I looked into PETG and how it performs for drinkware.

PETG is a glycol-modified polyethylene terephthalate that offers a good balance of clarity, toughness, and chemical resistance. It’s widely used for food-contact applications and, in this case, is advertised as BPA-free. I appreciated the BPA-free claim and the fact that PETG generally doesn’t absorb odors as much as some other plastics. That said, I avoid using very hot liquids in this cup regularly since most blender travel cups are intended primarily for cold and room-temperature beverages.

The product description had mixed language mentioning polycarbonate; I chose to trust the packaging and listing which indicate PETG. Either way, I felt comfortable using the cup for daily smoothie and shake routines.

Capacity and sizing

Capacity was straightforward and suited my needs. The cup’s 20 oz blended capacity matches the standard Blend-N-Go size, which is perfect for single servings or a generous protein shake.

I measured typical fills I use: 8–10 ounces of milk or liquid, 1–2 scoops of protein, a cup of frozen fruit, and a handful of ice — this filled the cup without overfilling and left a little headspace. That headspace is important because blending creates movement and foam, and the cup needs room to avoid overflow when blending.

I also liked that the two-piece pack gave me the flexibility to keep a filled cup in the fridge while still having a clean cup on hand.

Lid, straw, and spill resistance

The lid is a drink-through, spill-resistant design with a durable straw. In day-to-day use I found it convenient for sipping straight from the lid when I’m on the move.

The lid creates a secure seal when tightened, and the screw threads align properly with the cup. The straw is sturdy enough for smoothies and shakes, and I didn’t notice cracking or warping after repeated use. However, the lid is not completely leakproof if the cup is tipped upside down or shaken vigorously; it’s designed more for “drink-through” convenience and to limit spills in normal handling.

For me, that worked fine for gym bags and brief transportation, but I wouldn’t tuck this into a backpack with electronics without double-bagging or using a fully sealed travel container.

Fit and seal with blender base

A secure fit with the blender base is essential, both for safety and for effective blending. I threaded the cup onto an Oster Blend-N-Go base and it locked in place with the expected click. The blade assembly created a good seal, and I didn’t experience leaks during blending.

I found that it seats and removes with similar effort to an OEM cup. If you have an older or less common Oster model, I recommend verifying thread dimensions or trying one in-store if possible, but my experience was that Joystar matched the OEM fit for modern Oster Blend-N-Go units.

Performance in real use

I used the cup daily for several weeks, blending fruit smoothies, protein shakes, iced coffee, and occasionally hummus or dressings. That gave me a realistic sense of its performance across tasks.

First, blending performance. The cup’s walls were rigid enough that the vibration and torque from the blender base didn’t cause flex or wobble. That matters because soft cups can transfer vibration into leaks or poor blade contact. The jar’s shape promoted good circulation, and most blends I made reached a smooth consistency quickly.

Second, portability. The drink-through lid and straw made it convenient to sip on the go, and the 20 oz capacity was the right size for my commute and afternoons at work. I liked having two cups so I could blend one for immediate use and have another prepped and waiting.

Third, thermal performance. I mostly used the cup with cold or room-temperature liquids. It handled cold smoothies and iced coffee well, though PETG is not insulated, so drinks will warm over time in hot weather. I avoid very hot liquids in this cup because high heat can warp plastic and because the lid design isn’t engineered for steaming beverages.

Smoothie making and blending results

Smoothies turned out well. Ice and frozen fruit blended effectively into a creamy texture without needing extra water or long blending cycles. For thicker mixes I occasionally pulsed and shook the cup to encourage ingredients to move toward the blade, but that’s typical for single-serve blender cups.

I measured blending times with a typical recipe (banana, frozen berries, yogurt, ice, liquid) and consistently reached a smooth result in 30 to 50 seconds depending on how full the cup was and how frozen the ingredients were. That’s comparable to OEM cups I’ve used.

I also used the cup for thicker mixtures like nut-butter or hummus blends. For very dense mixes I found the cup can strain the blender motor if I overfill it, so I recommend smaller batches for heavy-duty tasks.

Cleaning and maintenance

Cleaning was straightforward but required attention. The manufacturer notes it “can’t be disinfected by dishwasher,” which I interpret to mean they don’t recommend relying on the dishwasher for sterilization or that dishwasher cleaning may degrade the cup over time. I hand washed the cup, lid, and straw with warm soapy water and a soft brush.

Hand washing removed residue effectively, and because the plastic is clear I could visually verify cleanliness. The straw and lid have small crevices, so I used a straw brush for the inside of the straw and a soft toothbrush for the lid threads. If you rinse immediately after use, cleanup becomes easier because dry smoothie residue can be harder to remove.

I tested a run through the top rack of a dishwasher once and found no immediate damage, but given the manufacturer’s caution and my preference to preserve clarity and seal integrity, I kept to hand washing for regular use.

Odor and stain resistance

One thing that varies across plastics is how much they hold odors or stains from ingredients like turmeric or beet juice. PETG performed well with typical smoothie ingredients — I didn’t notice lingering smells after routine cleaning. Brightly pigmented juices can sometimes leave faint discoloration over long-term use, so I rinse quickly after use and occasionally soak with a baking soda solution for stubborn stains.

Durability and long-term impressions

After several weeks of use, the cups showed minimal wear. The PETG remained clear and intact without cracking or crazing. The lid threads and the lip where it screws on held up well and didn’t strip.

I tested the cups in situations that are common for me: knocking them off a counter onto a tile floor, carrying them in a bag, and using them multiple times per day. They survived a few minor impacts that would have shattered thinner glass or inferior plastics. That’s why Joystar’s claim of “virtually unbreakable” felt accurate for everyday use.

However, I must be realistic: they are not indestructible. A strong drop onto a sharp object or sustained heavy pressure might still cause damage. For normal kitchen accidents and commuting, they feel rugged enough.

Safety and health considerations

I prefer products that reduce exposure to potential contaminants. The BPA-free PETG and no-metallic taste made me comfortable using these cups for food and beverage. I still avoid microwaving or boiling liquids in these cups because the material and lid are not designed for high-heat use.

For families with young children, I’d note that the lid and straw are small parts and should be kept out of reach of very young kids who might try to chew or disassemble them. I didn’t encounter safety issues, but keeping an eye on wear and ensuring the straw remains intact is good practice.

Pros and cons

I always weigh up positives and negatives to give a realistic picture. Here’s how I see the main advantages and drawbacks based on hands-on use.

Pros:

• Affordable and offers two cups in one package, which I found very convenient.
• PETG construction is sturdy and BPA-free, and withstands daily use without clouding or cracking.
• Compatible with many Oster Blend-N-Go and Classic Series blender bases; threads fit securely in my tests.
• Drink-through lid and a durable straw provide convenience for commuting and quick sipping.
• Clear material lets me see contents and check cleanliness easily.

Cons:

• Not guaranteed fully leakproof if inverted or shaken vigorously; the lid is more spill-resistant than fully sealed.
• Manufacturer advises against dishwasher disinfection, so hand washing is recommended, which can be inconvenient for some users.
• Not intended for hot liquids, so it’s limited to cold or room-temperature drinks.
• Fit may vary with very old or rare Oster models, so double-check compatibility if you have an uncommon blender.

I found the pros outweighed the cons for my lifestyle, but if you need a fully leakproof travel cup or one you can toss in the dishwasher every day, you may find the Joystar less convenient than some insulated travel bottles or OEM cups.

Who should consider buying this cup

I’d recommend this Joystar set if you:

• Own a compatible Oster Blend-N-Go or Classic Series blender and need a replacement or backup cup.
• Want an affordable, durable alternative to OEM cups without compromising fit or daily performance.
• Prefer a clear, uninsulated cup for smoothies, shakes, and iced beverages that are consumed within a few hours.
• Appreciate having two cups in a pack so you can switch between drinks and washed items.

I’d be more cautious about buying this if you need a fully leakproof container for transport in backpacks, want to microwave or handle very hot liquids, or demand dishwasher sterilization regularly.

How this cup compares to OEM and other aftermarket options

Comparing third-party cups against OEM versions and other aftermarket choices helps me decide if the value proposition makes sense.

• Versus OEM Oster cups: OEM cups often match your blender perfectly in fit and finish, and sometimes they come with warranties. Joystar’s cups, however, are typically cheaper and come in a two-pack, which increases value. I found the Joystar fit and functionally matched OEM cups for daily use, though OEM lids can be slightly more refined in seal design.
• Versus insulated travel mugs: Insulated mugs keep drinks hot or cold much longer, but they won’t attach to a blender base. If you need blending and portability combined, a blender-compatible cup like Joystar’s is better. If temperature retention is your priority, consider a vacuum-insulated bottle instead.
• Versus cheaper generic cups: Some very low-cost generic cups feel flimsy or have poor threading. Joystar felt sturdier and more thoughtfully made than several budget competitors I’ve tried.

Comparison table (brief):

Comparison	Joystar cup	OEM Oster cup	Insulated travel mug
Price	Lower (good value, two pack)	Higher (single cup)	Varies (often higher)
Fit with blender	Good in my tests	Perfect (designed for base)	Not compatible
Durability	Strong PETG	Typically strong	Very durable, insulated
Leakproof	Spill-resistant (not fully leakproof)	Often similar	Usually fully leakproof
Dishwasher	Not recommended for disinfection	Some OEMs are dishwasher-safe	Often top-rack or fully dishwasher-safe
Best use	Smoothies, shakes	OEM replacement	Temperature-sensitive drinks

From my perspective, Joystar hits a very solid sweet spot for people who want a reliable, cost-effective replacement without paying a premium for OEM branding.

Practical tips for best results

I like sharing the small tips I learned while using the cup because they made everyday use smoother for me.

• Hand wash recommended: Use warm soapy water and a soft brush for the lid threads and a straw brush for the straw. This preserves clarity and seal integrity.
• Avoid very hot liquids: PETG is great for cold and room-temperature beverages but not for steaming or boiling liquids.
• Don’t overfill: Leave some headspace for blending to prevent overflow and foam build-up.
• Pulse for dense mixtures: For thick blends like nut butter or hummus, pulse in short bursts and add liquid gradually to avoid stressing the motor.
• Inspect seals regularly: Over time, check the lid and straw for wear. Replace if you see cracks or deformation.
• Store with lid off: If you’re not using the cup for a day or longer, I store it with the lid off to prevent trapped moisture and odors.

These practical steps helped me keep the cups looking and performing well over time.

Frequently asked questions I considered

I often look at common buyer concerns before a purchase decision, so I tested or thought through these questions myself.

• Can you use hot beverages? I avoid that. The cup is designed for cold or room-temperature drinks.
• Is it dishwasher safe? The manufacturer notes it “can’t be disinfected by dishwasher,” so I recommend hand washing to preserve the cup.
• Does it fit all Oster blenders? It fits most modern Oster Blend-N-Go and many Classic Series models, but double-check your model if it’s an unusual or very old variant.
• Are the lids leakproof? The lids are spill-resistant and good for upright transport, but they’re not guaranteed to be fully leakproof when inverted or shaken vigorously.
• Will it absorb odors or stains? PETG handles most ingredients well, but rinse quickly after use and perform a baking soda soak for stubborn stains.

Those answers reflect what I experienced; another user’s mileage may vary depending on their exact blender model and usage patterns.

Final verdict

After using the Joystar 2 piece Blender Smoothie bottle cup with lid for Oster Blender Blend-N-Go Smoothie blender or Cup for Oster Classic Series blenders(2, PETG) over several weeks, I’m satisfied with its value and everyday performance. It’s a practical, economical choice for anyone who wants a reliable replacement or spare cup for an Oster Blend-N-Go or many Classic Series blenders.

I appreciated the sturdy PETG construction, the convenience of two cups, and the comfortable drink-through lid. The main limitations are the recommendation against dishwasher disinfection, the non-insulated design, and the fact that the lid isn’t fully leakproof when the cup is inverted. Still, for smoothie and shake lovers who prioritize cost-effectiveness and functionality, this set performs very well.

If you want a plug-and-play replacement that matches OEM fit for common Oster units and you’re comfortable hand washing and using it for cold drinks, this Joystar set is worth considering. I personally kept it as my daily go-to and found it dependable for my routine.

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