Hydro Flask 12 oz Kids Wide Mouth with Straw Cap and Boot (Koala, W12CSWBB499)
A durable, well insulated kids bottle for ages 3 and up, at a premium price.
The short version
- Kids 3 and up who carry water to school or camp
- Families who want cold water to last through a hot day
- Your child is under 3, which is below the maker's stated age
- You need more than 12 oz without refills
- You want the lowest price
What owners like
- Keeps water cold for many hours
- Sturdy enough to last for years
- Right size for small hands, and the boot helps it survive drops
- Straw stays in place and resists biting through
Common complaints
- Some reports of leaking, usually tied to the cap or straw not being fully closed
- 12 oz can be small for a full school day without refills
- Can feel heavy for children under 2
Based on Product details from Abt and Academy listings, a Made in Oregon listing and the Amazon listing title, plus parent review themes on Zappos and a Slickdeals discussion of the Koala bottle. Hydro Flask's own product page blocked access, so maker specs come from authorized retailer listings..
Research scores
Scored from the maker's specs and what owners report. Drew's own notes and photos will refine these.
Ownership
- Aug 2025
First bought.
Drew's hands-on notes for this product are on the way. Long-term updates will be added to this timeline.
What it does
A small insulated stainless steel kids bottle with a flip-up straw cap and a rubber boot, shown here in the Koala color; the linked Amazon listing is the same bottle in another color.
- Straw cap with a fold-down spout and carry loop
- Perforated silicone bottle boot to protect the base
- Integrated name tag
- Color Last powder coat that is dishwasher safe
- Slim shape fits most cup holders
A durable insulated bottle for kids 3 and up that keeps water cold through a school day and beyond. The trade-offs are a premium price, a modest 12 oz capacity and some reports of leaks when the cap is not fully closed.
How it compares
Specs
- Capacity
- 12 oz
- Material
- 18/8 pro-grade stainless steel, BPA-free
- Insulation
- TempShield double-wall vacuum, cold up to 24 hours
- Size
- 7.85 in tall, 2.85 in diameter, 0.55 lb
- Age
- 3 and up
- Warranty
- Limited lifetime, per an authorized retailer listing
Worth knowing
- Made for ages 3 and up.
- Not for use on a stove, in a microwave or in a freezer.
Questions
Is the Hydro Flask kids bottle dishwasher safe?
Yes. Retailer listings say the bottle and its Color Last powder coat are dishwasher safe.
What age is the 12 oz Hydro Flask kids bottle for?
Ages 3 and up, per the product listings.
Does the Hydro Flask kids straw cap leak?
Most parent reviews say it stays dry when the cap is twisted tight and the straw folded down, but some report leaks.
Can it go in the freezer or microwave?
No. Listings say it is not for use on a stove, in a microwave or in a freezer.
Sources
- Amazon listing B0CGS21T37
- Abt: Hydro Flask 12 oz Kids Wide Mouth Bottle with Straw Cap in Koala (W12CSWBB499)
- Academy: Hydro Flask 12 oz Wide Mouth Kids Water Bottle with Straw Cap and Boot
- Made in Oregon: Hydro Flask 12 oz Kids Wide Mouth Straw Cap and Boot
- Zappos: Hydro Flask 12 oz Wide Mouth with Straw Lid (Youth) reviews
- Slickdeals: Hydro Flask kids water bottle 12 oz Koala
Researched 2026-10-02. We bought this product; our page is built from the maker's details and what owners report across reviews and forums. We never copy Amazon customer reviews.