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#1 on this list
Wide Mouth 32 oz Sustain
Nalgene
The category's standard. Marked graduations, filter-compatible threads, and effectively indestructible.
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- How we assessed it
- Specification researched
#2 on this list
Wide Mouth 32 oz
Hydro Flask
The insulation benchmark: ice at hour 24, and a flex cap that survives being dropped on talus.
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Specs side by side
| Spec | Wide Mouth 32 oz Sustain | Wide Mouth 32 oz |
|---|---|---|
| Capacity | 32 fl oz (1 liter) | 32 oz (946 ml) |
| Material | BPA/BPS Free Tritan (50% recycled content) | 18/8 Pro-Grade Stainless Steel |
| Mouth Diameter | 63 mm | — |
| Weight | 6.25 oz (177 g) | — |
| Leakproof | Guaranteed | — |
| Temp Range | -40°F to 212°F | — |
| Insulation | — | TempShield Double-Wall Vacuum |
| Mouth Type | — | Wide Mouth |
| Cap Type | — | Flex Cap |
| Claimed Cold Retention | — | Up to 24 hours |
What our reviewers liked and didn't
Wide Mouth 32 oz Sustain
- Virtually indestructible construction, legendary durability
- Wide mouth allows easy cleaning, filling, and ice insertion
- Compatible with most common water filters and purifiers
- Clear volume markings for precise hydration tracking
- Leak-proof cap and robust threading provide total security
- Made with 50% recycled content (Sustain version)
- Not insulated; water temperature changes with environment
- Wide mouth can be awkward to drink from while moving
- Heavier than some minimalist plastic bottles
- Plastic can show cosmetic scratches over time
Wide Mouth 32 oz
- Unmatched temperature retention for hot and cold beverages
- Extremely durable 18/8 stainless steel construction
- Wide mouth makes cleaning and adding ice effortless
- Improved Flex Cap is comfortable and resilient
- Taste-free interior won't retain odors or flavors
- Heavier and bulkier than non-insulated bottles
- Higher price point compared to basic options
- May not fit all backpack side pockets comfortably
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