The North Face Surge 31L Backpack - Accessories。TNF White Metallic Melange - Mid Grey SURGE CLASSIC. With a 31-liter volume, the Surge backpack has more than enough room to accommodate your daily office carry. It also has a sleek, tech-inspired design and a coveted endorsement from the American Chiropractic Association. FLEX VENT TECHNOLOGY. The FlexVent suspension system, certified by the American Chiropractic Association, features a flexible yoke built from custom injection-molded and shoulder straps, a padded mesh back and a lumbar panel for ventilated support. TOTAL ORGANIZATION. This pack features a large main compartment for books and binders, a protective padded laptop sleeve, and a stand-up design to keep items securely inside. Also includes an external secure-zip pocket and two stretch mesh side pockets. TECH SPECS. Dimensions: 20\" x 13.25\" x 10.5\" (50.8cm x 33.7cm x 26.7cm). Laptop Sleeve: 10.25\" x 14\" (26cm x 35.6cm). Volume: 31 Liters. This item is not intended for use by children 12 and under.