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#3 on this list
TKWide 32 oz
Klean Kanteen
Climate-neutral certified steel with the best-sealing café cap in the business.
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- Specification researched
#4 on this list
BeFree 1.0 L
Katadyn
A soft flask with a 0.1-micron filter in the cap. The lightest drink-as-you-go system made.
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Specs side by side
| Spec | TKWide 32 oz | BeFree 1.0 L |
|---|---|---|
| Capacity | 32 oz (946 ml) | 1.0 Liter |
| Material | 18/8 Food-grade Stainless Steel | — |
| Insulation | Climate Lock™ Double-Wall Vacuum | — |
| Cap Type (Std.) | Leakproof Loop Cap | — |
| Weight (Empty) | Approximately 1 lb (450g) | — |
| Sustainability | Climate Neutral Certified | — |
| Maker | — | Katadyn |
| Filter Type | — | Hollow Fiber |
| Filter Pore Size | — | 0.1 Micron |
| Weight (empty) | — | 2.3 oz / 65 g |
| Flow Rate | — | Up to 2 L/min |
| Lifespan | — | Up to 1,000 Liters |
What our reviewers liked and didn't
TKWide 32 oz
- Exceptional temperature retention for hot and cold beverages
- Robust 18/8 stainless steel construction handles abuse
- Wide mouth design for easy cleaning, filling, and ice addition
- Internal threading prevents grime buildup
- Variety of well-designed, leakproof cap options available
- Climate Neutral certified and B Corp status
- Heavier than uninsulated or lighter insulated alternatives
- Powder coat finish prone to chipping with heavy use
- Tall profile might not fit all backpack pockets
BeFree 1.0 L
- Exceptional flow rate for a squeeze filter
- Incredibly lightweight and packable, especially when empty
- Instant purification directly from source to mouth
- Easy to clean in the field with a simple shake or squeeze
- Collapsible flask conforms to pack space
- Not suitable for extremely turbid water sources without pre-filtering
- Filter can be damaged by freezing temperatures
- Limited capacity for cooking or group hydration needs
- Higher initial cost than some basic squeeze filters
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