CamelBak Thrive® Flip Straw Kids Accessory Cap
The CamelBak Thrive® Flip Straw Kids Accessory Cap is a replacement cap and straw assembly for all CamelBak Thrive Flip Straw kids bottles. Flip, bite, sip — leak-proof when closed, spill-proof when open, BPA-free, dishwasher safe, and backed by CamelBak's Got Your Bak™ Lifetime Guarantee.
Our Take: The Thrive Flip Straw Kids Accessory Cap (CB-3121) is the simplest upgrade you can make to your child's hydration routine. It's a pint-sized version of CamelBak's popular adult Thrive Flip Straw cap — same one-flip mechanism, same self-sealing silicone bite valve, same leak-proof design, just sized perfectly for smaller Thrive Kids bottles. The dust cover keeps the valve clean during outdoor adventures, and the whole thing is BPA-free and dishwasher-safe (top rack). If your little one has worn out their original cap or you're switching bottle styles, this is an easy, affordable replacement backed by CamelBak's Got Your Bak Lifetime Guarantee.
Why you'd choose this cap
- One simple flip opens the cap. Kids bite the self-sealing silicone valve and sip — no unscrewing, no tipping, no struggling. The lid clicks shut securely when not in use.
- The cap locks tightly when flipped closed — no drips in school bags or car seats. When open, the self-sealing silicone bite valve only flows when the child actively bites and sips.
- An integrated dust cover shields the silicone bite valve from dirt, sand, and backpack lint while adventuring — keeping the drinking surface clean without a separate piece to lose.
- Made from BPA-free polypropylene body and food-grade silicone straw and valve. Free of BPA, BPS, and BPF. Safe for everyday use by children ages 3 and up.
- The straw and valve are specifically sized for CamelBak Thrive Kids bottles — shorter straw length, easier bite pressure, and a cap profile designed for smaller hands. Not compatible with adult Thrive bottles.
- Toss it on the top rack of the dishwasher for thorough cleaning. The straw and valve are removable for deeper cleaning. No hand-washing required (though it works too).
- The integrated carry handle makes it easy for kids to grab and go. Sized for small hands and sturdy enough for daily use at school, sports, and outdoor adventures.
- CamelBak's Got Your Bak Lifetime Guarantee covers this accessory cap against manufacturing defects for the lifetime of the product. If CamelBak built it, they'll back it.
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Perfect for
- School lunches — fits easily in lunchboxes, stays leak-proof in bags.
- Sports sidelines — quick flip-and-sip keeps game breaks short.
- Day hikes and camping — the dust cover keeps the valve clean on the trail.
- Replacing a lost, damaged, or worn-out cap on an existing Thrive Kids bottle.
You may need a different CamelBak part if…
- You only need replacement bite valves and straws (cap is fine) — the Thrive Kids Bite Valve 4-Pack ($16.95) includes 4 colored valves + 2 straws.
- You have an Eddy+ Kids bottle (not Thrive) — the Eddy+ Kids Bite Valve and Straw Set is what you need.
- You have an old-style Eddy Kids bottle (pre-2019, no "+" mark) — the Eddy Kids Straw and Bite Valve Set is the correct part.
- You need a new complete bottle — the Thrive Flip Straw Kids 14oz Bottle starts at $14.95 in 11 colors.
Thrive® Flip Straw Kids Accessory Cap — Specifications
| Specification | Value |
|---|---|
| Product name | CamelBak Thrive® Flip Straw Kids Accessory Cap |
| Brand / SKU | CamelBak / CB-3121 |
| Type | Replacement cap and straw assembly |
| Compatible bottles | CamelBak Thrive Flip Straw kids bottles (all sizes) |
| Not compatible with | Adult Thrive bottles (CB-3120), Eddy+ Kids, old-style Eddy Kids, Podium, Chute |
| Drink mechanism | Flip-open lid + silicone bite valve straw |
| Dust cover | Yes — integrated, protects silicone valve |
| Leak-proof (closed) | Yes |
| Spill-resistant (open) | Yes — bite-activated valve only flows when sipping |
| Materials | 70% PP Copolymer, 30% Silicone — BPA/BPS/BPF free |
| Dimensions | 15.8 cm × 5.1 cm × 10.7 cm |
| Weight | 81 g (2.9 oz) |
| Dishwasher safe | Yes — top rack |
| Color | Black |
| Recommended age | 3+ |
| Warranty | Got Your Bak™ Lifetime Guarantee |
| MSRP | $13.00 USD |
How This Cap Compares
Focus or hover a row label for a plain-English definition. Press Escape to dismiss the tooltip.
Compatibility & Type
| Feature |
Thrive Kids FSKids Cap
|
Bite Valve 4pkKids Accessory
|
Eddy+ Kids BVKids Accessory
|
Thrive Kids 14ozKids Bottle
|
|---|---|---|---|---|
| Product type?Whether this is a cap, valve pack, or complete bottle. | Replacement cap | Valve + straw set | Valve + straw set | Complete bottle |
| Fits Thrive Kids bottles?Compatible with CamelBak Thrive Flip Straw kids bottles. | Yes | Yes | No | N/A — is the bottle |
| Fits Eddy+ Kids bottles?Compatible with CamelBak Eddy+ Kids bottles. | No | No | Yes | No |
Features
| Feature |
Thrive Kids FSKids Cap
|
Bite Valve 4pkKids Accessory
|
Eddy+ Kids BVKids Accessory
|
Thrive Kids 14ozKids Bottle
|
|---|---|---|---|---|
| Drink mechanism?How the child drinks from this product. | Flip + bite valve straw | Bite valve straw | Bite valve straw | Flip + bite valve straw |
| Dust cover?Built-in cover to keep the valve clean. | Yes | No | No | Yes |
| Leak-proof (closed)?Prevents leaks when the cap is in the closed position. | Yes | Valve only | Valve only | Yes |
| Cap + straw included?Whether a full cap assembly with straw is included. | Yes | Valves + straws only | Valves + straws only | Yes |
| BPA-free?Free of bisphenol A, a chemical found in some plastics. | Yes | Yes | Yes | Yes |
| Dishwasher safe?Can be cleaned in a dishwasher (top rack). | Yes | Yes | Yes | Yes |
| Lifetime guarantee?CamelBak's Got Your Bak Lifetime Guarantee against defects. | Yes | Yes | Yes | Yes |
CamelBak Kids Replacement Parts at a Glance
★ You Are Here
- From $9.95
- Thrive Flip Straw Kids Accessory Cap — complete replacement cap with straw, dust cover, and carry handle.
- View on heartratemonitorsusa.com →
Valves + Straws Only
- From $16.95
- Thrive Kids Bite Valve Multi-Color — 4 colored bite valves + 2 straws. For when the valve is worn but the cap is fine.
- View on heartratemonitorsusa.com →
Different Series — Eddy+
- From $7.95
- Eddy+ Kids Bite Valve and Straw Set — for Eddy+ Kids bottles only. Not compatible with Thrive bottles.
- View on heartratemonitorsusa.com →
Need a New Bottle?
- From $14.95
- Thrive Flip Straw Kids 14oz Bottle — complete bottle with Tritan Renew. 11 colors available.
- View on heartratemonitorsusa.com →
CA Residents: Prop 65 Warning
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Thrive® Flip Straw Kids Cap — Frequently Asked Questions
Which CamelBak bottles does this cap fit?
The Thrive Flip Straw Kids Accessory Cap fits all CamelBak Thrive Flip Straw kids bottle sizes. It does NOT fit adult Thrive bottles (use CB-3120 instead), Eddy+ Kids bottles, old-style Eddy Kids bottles, or any other CamelBak series such as Podium or Chute.
Is the cap BPA-free and safe for kids?
Yes. The cap is made from BPA-free polypropylene and food-grade silicone. It is free of BPA, BPS, and BPF, making it safe for everyday use by children ages 3 and up.
Is it dishwasher safe?
Yes. CamelBak recommends washing cap components on the top rack of the dishwasher. You can also hand-wash with warm soapy water. Remove the silicone straw and valve before washing for the most thorough clean.
Does the cap leak?
The cap is leak-proof when the flip lid is closed and spill-resistant when open. The silicone bite valve only allows flow when the child actively bites and sips, which greatly reduces accidental spills.
What is included with this accessory cap?
The package includes one Thrive Flip Straw Kids Accessory Cap with an integrated silicone bite valve, one kids-length silicone straw, and an integrated dust cover. No bottles are included.
What is CamelBak's Got Your Bak Lifetime Guarantee?
CamelBak's Got Your Bak Lifetime Guarantee covers all reservoirs, backpacks, bottles, and accessories against manufacturing defects for the lifetime of the product. This includes the Thrive Kids Accessory Cap. Defect claims can be filed through CamelBak customer support at camelbak.com.
What is the difference between the kids cap and the adult Thrive cap?
The kids version (CB-3121) has a shorter straw sized for smaller Thrive Kids bottles and easier sipping ergonomics for children. The adult Thrive Flip Straw Accessory Cap (CB-3120) has a longer straw designed for larger adult Thrive bottles. The two are not interchangeable.
Support
If you have questions about this product, please contact sales at 215-259-2700 or 800-403-8285.