To stay fast and light on thru-hikes, we load up the MYSTERY RANCH Radix 57L Backpack. The removable frame, lid, waist belt, and compression straps let us choose the gram count, storage, and carry that suits our endeavor, while the padded, ergonomic, woman-specific harness gives us a comfy carry no matter which configuration we choose. As we trek deep into the backcountry, the technical, ripstop materials resist tears and abrasions without breaking our shoulders. And when it's time to set up camp for the night, the full-length front zip gives us quick-and-easy access to our gear.