Hydrapak's UltraFlasks™ are designed to conform to the shape of your body, compressing as you drink - this means reduced sloshing and bouncing, less
TAILWIND
FITLY Soft Flask 500ml - Shrinks As You Drink Soft Water Bottle
Salomon Soft Flask XA FILTER 490ml
Tailwind Nutrition Endurance Fuel Single Serve Stick - 54g
Powder nutrition - “hack” so you don't spill everywhere during
Tailwind Nutrition Soft Flask (Translucent) - Performance Bicycle
2 Pack Folding TPU Soft Flask 500ml Outdoor Collapsible Water
Running Water Bottles and Soft Flasks
Aonijie 500ml Quick Stow Soft Flask - Trailbusters