The women-specific FlexVent™ suspension system, certified by the American Chiropractic Association, has articulated shoulder straps, a rounded back panel, comfortable stitch lines and soft-touch chemise fabric External bungee-compression system with clips offers several options for organization Side bungee cords allow for compression Bottom compression Protective dedicated laptop compartment Large main compartment for books and binders Front compartment has internal organization with secure-zip pockets and a padded tablet sleeve External, fleece-lined pocket for sunglasses, phone or keys 360-degree reflectivity Two durable, external water bottle pockets can easily double as multi-use pockets with quick-draw smartphone access on one side U-pull zippers are easy to grab Comfortable, padded top grab handle Sternum strap with a whistle buckle Removable waist belt Sizes:One size Solid:210D recycled nylon ripstop with non-PFC durable water-repellent (non-PFC DWR) finish Avg Weight:2 lbs 1 oz (930 g) Heather:300D heathered recycled polyester with non-PFC DWR finish Dimensions:11'' x 5.75'' x 18.75'' (27.9 cm x 14.6 cm x 47.6 cm) Volume:1648 in³ (27 liters) Laptop Sleeve:12.5'' x 11'' (31.8 cm) ✔Reasonable offers welcome thanks