Hydro Flask 21oz Standard Mouth vs Hydro Flask Standard Mouth 21oz
Hydro Flask 21oz Standard Mouth ($40) vs Hydro Flask Standard Mouth 21oz ($40) — side-by-side specs, weight, pros and cons to help you pick the right water bottle.
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Hydro Flask
21oz Standard Mouth
$40
Best Mid-Size
Check Price →
Spec-by-spec
| Spec | Hydro Flask 21oz Standard Mouth | Hydro Flask Standard Mouth 21oz |
|---|
| Price | $40 | $40 |
| Weight | 308g | 320g |
| Capacity | 21oz (621ml) | 21oz (621ml) |
| Insulation | TempShield double-wall | TempShield double-wall vacuum |
| Cold | 24h ice retention | Up to 24 hours |
| Hot | 12h | Up to 12 hours |
| Mouth | Standard | — |
| Lid | Flex Straw Cap included | — |
| Material | — | 18/8 pro-grade stainless |
| Finish | — | Powder coat chip-resistant |
| Weight | — | 320g |
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 21oz
- TempShield 24h cold insulation proven
- Powder coat durable finish
- 21oz fits standard bottle pockets
- Standard Mouth sip-direct or use a straw lid
- Wide Hydro Flask accessory ecosystem
- $40 — not budget hydration
- 320g solid weight
- Standard Mouth less versatile than wide for cleaning
Hydro Flask 21oz Standard Mouth is the better value at $40. Both are part of our curated water bottle index — tap through to check current pricing.