Klim Hydrapak Reservoir 3 liter (100 OZ) hydration reservoir Push button quick release hose connection (bladder and hose can be separated allowing bladder to be removed and hose to remain threaded through pack) Fold and slide wide opening for easy cleaning / filling (can pull inside out for cleaning and drying) 48 pinch-resistant heavy duty drink tube can be cut to desired length Constructed of FDA approved polyurethane (TPU) Anti-microbial Extremely tough Straight valve high flow rate mouthpiece with 360 degree bite One-handed locking on / off positions BPA and PVC free allows taste-free water