Flexible flask that compresses as you drink it to eliminate water bouncing inside and reduce sucking effort. No leaking until you bite it
PVC, Bisphenol-A free - FDA approved polyurethane.
TPU (thermoplastic Polyurethane) - Used for specific properties like -elasticity, then comfort close to the back -transparency, to clearly see the water level inside -resistance to any liquid, then taste free -PVC free, then no toxic substances reject when recycled Thermoplastic polyurethanes are perfect for bladder and tube.
Blaster valve - A new engineered valve that blast water for quick and non-fatigue hydration. Higher flow, softer feeling in mouth, no leaking.