WACOOL 3L 3Liter 100oz BPA Free EVA Hydration Pack Bladder , Leak-proof Water Reservoir https://www.amazon.com/dp/B016SSZ...mAbPG1B19B
Capacity: 3 Liter (100oz), 100% odorless, tasteless, BPA- Free EVA material
Might be the most rigid hydration bladder on the market: 0.6mm extra thick liner is pressure-tolerant and wear-proof; double soldering sealing side technique has greatly improved durability.
Double opening design. As the most popular design for high end hydration systems in recent years, this allows you to refill in any condition.
Easy to fill and insert into the pack, easy cleaning design, dual large opening.