The most intuitive leakproof valve to hydrate easily. Soft mouth contact.
Easy to disconnect the tube from the bladder event when full.
FDA approved polyurethane.
Easiest to clean, turn it inside out.
Choose the orientation of the bladder exit, to the top or to the side, to fit your backpack.
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.