VersaFit adjustable torso and hipbelt to provide the proper fit for growing Hikers Large Zippered hipbelt pockets with enough space for most phones Padded, 3D foam backpanel to provide close-to-back breathability Perforated Foam shoulder harnesses for breathability and an integrated safety whistle Wishbone alloy frame to properly support a heavy load while maintaining some flexibility to provide comfort as you move Front U-Zip access to the main compartment of the pack, to easily get to gear at the bottom of the pack