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Cradle Score
Sippy & straw cups

Thermos FUNtainer Insulated Straw Bottle

About $19Checked Oct 17, 20262 sources

Our take

A tough insulated stainless steel straw bottle that keeps water cold for hours, better for toddlers than young babies. Some leaking, and determined chewers can bite through the straw.

Stainless steelInsulatedStraw

Consider instead: Pura Kiki for a leak-proof stainless option.

Before you buy

Do you need it?Later Offer water in a cup with meals from around 6 months, and aim to move off bottles between 12 and 18 months.
Cost per monthAbout $1.06 a month over a typical 18 months of use. Our estimate; your use may be shorter or longer.
Cheaper optionDr. Brown's Milestones Cheers 360 Cup: About $6-9, scored 78 (Good).
Secondhand?Buy new. Buy new; valves and straws wear out.
TipStraw and open cups are easier on developing mouths than hard spouts.

What parents and testers say

Recurring praise

  • Keeps drinks cold
  • Very durable
  • Attached lid

Recurring complaints

  • Some leaks
  • Heavy for small babies
  • Straw needs a brush and can be chewed through

Our summary of patterns across the reviews and threads linked below, not quotes.

Materials & safety check

2 of 2 checks clear.

MaterialStainless steel with silicone straw
RecallsNone found for Thermos in CPSC cup recalls

When to buy it

Registry

Optional

~6 months

Offer water in a cup at meals as solids start

12-18 months

Aim to finish with bottles

Other sippy & straw cups we scored

See all sippy & straw cups →
84+5 pts

Pura Kiki Vacuum Insulated Toddler Sippy Cup

About $40 · Good

78-1 pts

Munchkin Miracle 360 Trainer Cup

About $13 for 2 · Good

78-1 pts

Dr. Brown's Milestones Cheers 360 Cup

About $6-9 · Good

Own this? Tell us how it's going

Reports from parents who've used a product for months are the hardest thing to find. Yours goes only to our team and helps keep this score honest. It isn't published.

How do you feel about it?

Common questions

Is the Thermos FUNtainer Insulated Straw Bottle non-toxic?

There's no legal definition of "non-toxic" for baby products, so here's what we checked. Material: Stainless steel with silicone straw. Recalls: None found for Thermos in CPSC cup recalls. It scores 86 out of 100 on materials and safety, and 79 overall.

Not sure what a label means? See baby product labels, explained.

Sources

  1. BabyGearLab: Best sippy cups (Jan 2025)babygearlab.com
  2. CPSC recall database: "cup" recalls since 2020saferproducts.gov
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