Travel bag Details: This Expandable Tactical Backpack is constructed with high quality 600 Denier polyester material, heavy oversized zippers and tabs. Expandable main compartment with multiple gear pouches and Molle compatibility that allows customizing the pack for your needs main compartment expands an additional 5 to accommodate extra vital assault gear to complete your mission. Main compartment expands from 39 liters(2380 cu in)to 64 liters (3905 cu in). Side parachute buckles allow for tightening to provide a compact. The Overall Function Description: This is an expanded high quality universal models outdoor Backpack. Two Size of Loading Space, DIY System ,suitable for most people to Travel, Camping ,Hunting, Trekking and Hiking Description Of Each Part(what you can hold): Front Compartment (11 "X7") :Mobile phones, walkie-talkies, pens, batteries, chargers, keys, laptops, tablets, wallets, documents, etc. Middle Compartment (15 "X10"): IPAD, tablet, notebook computer, etc. Main Compartment (20 "X13") :clothing , tent, big laptop computer Package Other Function Description: *An Organizer pocket has several mesh compartments built in. Side parachute clasps. Easy grip zipper pulls .Back support belt with parachute clasps *It can be compressed to 39 liters or expanded to 64 liters of carrying space. Side parachure claps allow for tightening to provide a compact , easy to transport pack. *Constructed of 600 denier polyester with vinyl backing *Easy grip zipper pulls *Water resistant Packaging Description Weight：2.6 lbs Carton Dimension: 21 x 16 x 14 Inches /10 pcs in each box One Dimension(with USPS box):16x10x4 Inches /1 pcs