Evoc Stage 3L+2L Bladder EVS3-LP Light Petrol Technical Bike Hydration Backpack Material: Nylon 210/D Ripstop PU coated, P600/D PU coated, 3D Air Mesh, Air Mesh, Airo Flex Volume: 183cu in Support/Suspension: Brace Link Waist Belt: yes, removable Hydration Compatible: yes