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The Mountainsmith Red Rock 25 Backpack is constructed from 450-denier ReDura PET material and a 210-denier ripstop liner for durability. The air mesh back panel with lumbar support provides breathability, and the elastic sternum strap lends support. The shoulder strap attachment loop attaches Mountainsmith camera cases to the backpack, while the side panel mesh pockets hold your water bottle. Interior organizer sleeve.