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UltraFlask™ 300ml (10oz)

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Ideal for quick hydration straight from your hand, pocket, waist belt, hydration vest or pack. The Ultra Flask 300 with large 42mm opening, lets you fill /re-fill quickly and easily with ice and drink mixes. It shrinks as you drink, minimizing water movement. Fits easily in most hydration vest, belt or backpack pockets. Beyond Lifetime Guarantee.


- Soft silicone, self sealing, high flow, easy to clean bite valve
- Modular and able to integrate within a variety of packs, vests, belts and pockets
- Collapsible

- Can be frozen or filled with hot water (max temp 60° C / 140° F)
- Large 42mm opening
- 100% BPA Free
- 100% PVC Free
- Dishwasher Safe, top shelf
- Exceeds FDA & EU regulations
- Naturally Anti-fungal
- Beyond Lifetime Guarantee


- 300ml (10 oz) capacity
- Thermoplastic Polyurethane; Silicone; HDPE
- 42mm opening
- Dishwasher safe (top rack)/Freezer safe
- Weight: 32g (1.1 oz)
- Dimensions: 85mm L x 70mm W (3.3.5" L x 2.75" W)