EVOC: Thermally insulated HYDRATION BLADDER for backpacks - makes our backpacks hydration packs.• Slide-Seal™ Top with Tether• 36” HydraFlex™ Tube• Blaster™ Bite Valve• Plug-N-Play™ Connect System• Removable Pack Clip• Silicone Lubrication• Basic Care & Use InstructionsMaterial:  THERMOPLASTIC POLYURETHANE; HDPE; SILICONE2L, 140g, 17 x 32 cm