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Hydro Flask 21oz Standard Mouth vs Hydro Flask Standard Mouth 24oz
Hydro Flask 21oz Standard Mouth ($40) vs Hydro Flask Standard Mouth 24oz ($39.95) — side-by-side specs, weight, pros and cons to help you pick the right water bottle.
Spec-by-spec
| Spec | Hydro Flask 21oz Standard Mouth | Hydro Flask Standard Mouth 24oz |
|---|---|---|
| Price | $40 | $39.95 |
| Weight | 308g | 376.5g |
| Capacity | 21oz (621ml) | — |
| Insulation | TempShield double-wall | — |
| Cold | 24h ice retention | — |
| Hot | 12h | — |
| Mouth | Standard | — |
| Lid | Flex Straw Cap included | — |
| Material | — | 18/8 stainless steel |
| Weight | — | 376.5g (Hydro Flask published) |
Pros & Cons
Hydro Flask 21oz Standard Mouth
- 21oz fits most bag bottle pockets
- 24h ice retention is real
- Flex Straw Cap best in class
- No condensation ever
- Hundreds of color options
- $40 for a bottle is a lot
- 308g medium weight
- Standard mouth harder to clean
Hydro Flask Standard Mouth 24oz
- Insulated stainless body
- Mid-size 24 oz capacity
- Large color range
- 376.5 g empty
- Published weight is rounded to 0.01 lb
Hydro Flask Standard Mouth 24oz is the better value at $39.95. If weight matters most, Hydro Flask 21oz Standard Mouth carries lighter at 308g. Both are part of our curated water bottle index — tap through to check current pricing.
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