General: The WXP is a high-performance 2L hydration reservoir system with a patented Storm Valve from Source. Thanks to the built-in glass liner technology with Grunge Guard, bacteria have no chance. This unique antimicrobial system reliably inhibits bacterial growth from the outset. source uses a multi-layered polyethylene film that is 2000% smoother than standard TPU films and consequently prevents a biofilm build-up. Thus is the system self-cleaning. Even after months in use can always be easily refilled water without a need for cleaning. Taste-free technology provides odorless water without any plastic taste. Details: Cool Cover Tube insulated and blocked UV light (water remains cool and free of bacteria) QMT Source QuickMate technology provides a quick and easy installation Patented Push / Pull StormValve Integrated valve cut-off Dirt Shield Valve Caps Wide pace Wide Opening Access for easy filling, emptying and cleaning. Airtight seal! (U.S. Patent No. 7,648,276, B2) Specifications WXP 2L: Liquid capacity: 2L / 100oz Drinking system: WXP Tube: tube cover 94cm / 37 inch Long PE-Valve: Angled Storm-Valve Weight: 0.22 kg / 0.49 lbs Reservoir: 435 µm co-extruded Glass-Like Dimensions WXP 2L: empty: Length 14.8 inch/ 37.5 cm Width 7.7 inch/ 19.5 cm Max. Depth 1 inch/ 2,5 cm full length 13,4 inch/ 34 cm width 5.5 inch/ 14 cm Max. Depth 3.1 inch/ 8 cm The color of a variant is always the color of the tube, not of the drinking bubble!