<p><p><b>The Overall Function Description:</b></p> This is a universal bag that can be expanded. It is suitable for most people, men, women, old and young, and suitable for most occasions, such as travel, outdoor activities, sports, work and life.</p> <p><p><b>Description Of Each Part(what you can hold):</b></p> Front Compartment (11 "X7") :mobile phone, walkie talkie, pen, battery, charger, key, notebook, tablet, wallet, ID and so on <br>Middle Compartment (15 "X10"): IPAD, tablet, notebook computer, etc. </br>Main Compartment (20 "X13") :clothing , tent, big laptop computer <br>The main Compartment with tight rope: whistles, scissors, clips, small medical bags and other small objects </br>Straps (6 "X3"): walkie talkie <br>Back Compartment (19 "x14") :water bag, clothing, blankets etc.</br> Side pouch :kettle, umbrella</p> <p><p><b>Package Other Function Description:</b></p> *Main compartment expands from 39 liters (2380 cu in) to 64 liters (3905 cu in). <br>*Heavy oversized zippers and tabs </br>*Holds up to 3.0 liter hydration bladder <br>*Side parachute buckles allow for tightening to provide a compact, easy to transport pack</br> *Revers-able zippers to keep out dust and dirt (on B model only)</p> <p><p><b>Packaging Description</b></p>Weight：3.6 lbs <br>Carton Dimension: 21 x 16 x 14 Inches /10 pcs in each </br>box One Dimension(with USPS box):13x11x3 Inches /1 pcs</p>