The name says it all: the Classic is the quintessential bike hydration pack, now updated with a Crux™ reservoir for a faster flow of water. The brand new Crux delivers 20% more water per sip, with an ergonomic handle for easier refilling, and an on/off lever that makes it easy to prevent leaks. Breathable air mesh back panel for a lightweight, comfortable fit. Reflective accents for visibility in low-light environments. Secure zippered pocket for essentials. Lightweight, ventilated mesh harness. Activity: Cycling. User: Unisex. Hydration Capacity: 2.5L/85 fl. oz. Hydration Type: CRUX™ Reservoir with Standard Exit Port. BPA/BPS/BPF Free: Yes. Quick Link Disconnect: No. Gear Capacity: 0.5L/30 cu. in. Pack Weight: 170 g/5 oz. Dimensions: 38.5 x 22 x 11.5 cm / 15.2 x 8.7 x 4.5 in. Fits Torso: 38-53 cm/15-21 in. Back Panel: Padded mesh. Number Of Exterior Pockets: 2. Imported.