PANS Backpack Large Military Expandable Travel Backpack Tactical Waterproof Hiking Backpack for Men

Front Compartment (11 "X7") :mobile phone, walkie talkie, pen, battery, charger, key, notebook, tablet, wallet, ID and so on
Middle Compartment (15 "X10"): IPAD, tablet, notebook computer, etc.
Main Compartment (20 "X13") :clothing , tent, big laptop computer
The main Compartment with tight rope: whistles, scissors, clips, small medical bags and other small objects
Straps (6 "X3"): walkie talkie
Back Compartment (19 "x14") :water bag, clothing, blankets etc.
Side pouch :kettle, umbrella