The improved design Salomon soft flask manufactured by Hydrapak are flexible. You can compress the bottle as you drink to eliminate water bouncing/sloshing inside and reduce sucking effort. Easy to squeeze – with durable bite valve. Carry this soft water/gel flask in your hand, shorts pocket or race vest pouch. Carry gels, water, electrolytes and other fluids such as milkshake. The compact/space-saving and lightweight solution to carrying your hydration/electrolyte/nutrition fluids.