The 1.5L Bladder is an incredibly user-friendly bladder with tonnes of easy-to-use design features. The bladder features a Slide-Seal™ top, which opens wide for easy filling, while also closing tight for a leakproof seal. This system also allows you to completely reverse the bladder for easy cleaning. The bladder is constructed from ultra-durable, abrasion resistant TPU with RF welded seams which optimise the bladder’s rugged design and functional elasticity. These materials are also safe and reliable – being both 100% BPA and PVC free. For easy drinking on the move, the High-Flow Blaster™ 45-degree bite valve self-seals after each sip, preventing leakage. The bite valve also has a twist on/off feature that further prevents leaks when not in use. Meanwhile, the Plug-N-Play™ coupling system makes it easy to disconnect the drink tube, allowing you to easily remove the bladder from your pack. Care Instructions For best results, in keeping the bladder clean, clean the 1.5L Elite Bladder with soap and water and let it dry completely between every use. Alternatively, the bladder is top-shelf dishwasher safe. The bladder is especially easy to clean because it is completely reversible.