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It's a good size for a commuter’s backpack – especially if it includes a laptop pocket. 30-40L: a better size for a long weekend away or a day trip where you need to bring more with you. 40-50L ...

Military Tactical backpack size approx.:13"*20"*11" / 33*50.5*28CM (W*H*D),Capacity: 40L; Military backpack is made of high density fabric--durable and water-resistant Molle tactical backpack has ...