UltraSpire SoftFlask 800ml with Locking Cap - High-Capacity Running Flask

Sometimes 500ml isn't quite enough to get you through that remote stretch of the Bluff Trail or a humid July afternoon in the highlands. The UltraSpire SoftFlask 800ml is the "long-haul" answer to portable hydration. It provides that extra volume you need for self-supported efforts without the bulk or "slosh" of a traditional rigid bottle. This version features a secure, thumb-activated locking cap rather than a bite valve, making it the perfect choice for stashing in a pack side pocket or a large waist belt where you need 100% leak-proof security. As you drink, the flask collapses, keeping your water quiet and your gear dry, no matter how technical the terrain gets.

• Extended 800ml Capacity: Offers significantly more volume than standard 500ml flasks, perfect for longer gaps between water sources or high-sweat training days.
• Leak-Proof Locking Cap: A secure, twist-to-lock or thumb-lock design that ensures your water stays in the bottle even when it's being squeezed inside a tight pack pocket.
• Collapsible Design: The soft, flexible TPU material shrinks as you hydrate, eliminating air and preventing the annoying "water-slap" sound common with hard bottles.
• Tapered Fit: While larger in volume, the flask maintains a streamlined shape designed to fit comfortably in larger vest pockets, waist packs, or the side sleeves of your favorite daypack.
• Safe & Durable Construction: Made from abrasion-resistant, food-grade TPU that is BPA, PVC, and Phthalate-free, ensuring your water tastes like water, not plastic.
• High-Flow Performance: The wide cap allows for rapid drinking and fast refills, so you can spend more time moving and less time standing at the tap.

Best For

• The Effort: Self-supported long runs, fast-packing, and high-intensity hiking.
• The Goal: Carrying more water with less bounce and absolute leak-proof security in your gear.
• The Conditions: Hot Maritime summers, remote trails, and adventures where refill points are few and far between.

Technical Specifications

• Capacity: 800 ml / 27 fl oz
• Weight: Approx. 45 g / 1.6 oz
• Cap Type: High-flow locking cap
• Material: 100% BPA & PVC Free TPU
• Dimensions: Designed to fit standard larger hydration pockets