A purpose designed bottle for running/hydration vests, with a vest-pocket-friendly long thin shape and soft structure (so there's less chance of rubbing). Features High Flow - Bite valve auto-seals after each sip, eliminating annoying drips Large Mouth - Large 42mm opening lets you fill easily with ice and drink mixes Filter Friendly - Compatible with Katadyn BeFree, Salomon XA Filter, Lifestraw Peak Series filters Comfortable Fit - Soft material conforms to most hydration vests, belts, or pack pockets Compressible - Flexible design shrinks as you drink reducing water movement Easy To Clean - Cap and valves come completely apart, top-rack dishwasher safe Proven Performance - Made of ultra-durable, abrasion resistant TPU & RF welded seams for superior durability and elasticity Safe And Reliable - 100% BPA & PVC free, top-rack dishwasher safe Capacity: 500ml Weight: 54g Dimensions (full): 60x60x255mm