TYR Transition Backpack Dimensions: 13W" x 19H" x 12D" Designed for triathlon gear, multiple storage compartments and pockets provide race-time organization including: two large internal mesh shoe pockets for running shoes & cycling shoes, a large Outside Mesh Pocket for gear & accessories and an external helmet pocket that features safety clips & bungee straps. Engineered for triathletes that demand performance, the LTRA Transition Backpack features a removable Waterproof Bag for wet items, while a 5" expandable mesh bottom can accommodate your wetsuit and soiled race gear. A dual-zip main compartment can be fully opened to provide quick and easy access, while two external mesh water bottle pockets keep hydration at your fingertips. Two padded side pockets allow for storage of digital media and headphone slits keep wires out of the way. Reflective external binding treatments provide low-light safety and enhanced visibility.