Patented Back Comfort Technology holds backrest position at any angle * Patented Auto-Fold Shoulder Strap Technology and backpack straps for easy opening, closing and carrying * Cushioned lumbar support pad and beverage holder * Open size is 17? x 25.5? x 31.5? and folds to 28.5? x 25.75? x 4.25? * Supports 300 lbs yet weighs only 9 lbs