The Bug was designed specifically for multi-pitch, long routes that are done in a single day. Its rounded rectangular shape maximizes volume and minimizes interference while in use. The volume of the BUG is ideal for carrying gear on the approach and when climbing (hydration system, guidebook/topo, clothing, shoes, etc). Everything has been designed for maximum comfort while climbing with the BUG on the back: minimal bulk, shoulder straps allowing freedom of arm movement, comfortable and ventilated back panel, foldaway waistbelt, high positioning allows access to back of harness (for chalkbag, gear) & lateral compression straps. Waistbelt provides additional carry comfort for heavy loads and tucks away to leave freedom of movement when climbing. Rounded rectangular shape: great balance between volume and shape provides plenty of room for gear without interfering with your climbing. and reduces wear from abrasion. Astute design includes a guidebook pocket on the outside for quick and easy access, attachment loop for your e+LITE (emergency headlamp), zippered mesh pocket with key clip, small pocket on the shoulder strap for a topo map, and is hydration system compatible. Adjustable height sternum strap enhances security and comfort.