1. Military Tactical Assault Pack Backpack Small Army Molle Bug Out Bag Backpacks Rucksack for Outdoor Hiking Camping Hunting School 34L ACU (Click Link to Check Price on Amazon)
Editor's Rating : 9.8 out of 10
Tactical assualt backpack Capacity: 34L. Size approx.:11"*18"*12" / 28*45.5*30CM (W*H*D), it's not big backpack Military backpack is made of high density fabric-durable and water-resistant.

2. Mardingtop Military Backpack/Tactical Molle Backpack/Rucksack Bag for Shotting Hunting Camping Hiking Trekking Khaki (Click Link to Check Price on Amazon)
Editor's Rating : 9.2 out of 10
MATERIAL- 35 Liters. This tactical backpack is made of Water-resistant 600D polyester. If you want more big tactical backpack (50 Liter), you can please check this product B01LPJUP9K at our store.VELCRO- Velcro nametape and flag patches.

3. G4Free Outdoor Tactical Backpack,Military Sport Pack Shoulder Backpack for Camping, Hiking, Trekking,Rover Sling Pack Chest Pack(CP Camouflage) (Click Link to Check Price on Amazon)
Editor's Rating : 9.9 out of 10
Handy, versatile 3 ways carrying style (Shoulder Bag, Chest Sling - Back Sling, Hand Carry) ,small MOLLE pouch.Small, compact, goes anywhere design is perfect where large packs are too big, too bulky, too heavy.

4. Z ZTDM Outdoor Tactical Molle Backpack Military Rucksacks for Camping Hiking Trekking Waterproof 30L Tan (Click Link to Check Price on Amazon)
Editor's Rating : 9.5 out of 10
WaterproofMaterial: Oxford

5. HUKOER Tactical Rucksack - Fashionable 30L Multiple Colors Water-resistant Outdoor Tactical Shoulder Hiking Daypack Military & Sport Casual Backpack for Camping Trekking Travel Hunting (ACU Color) (Click Link to Check Price on Amazon)
Editor's Rating : 8.9 out of 10
Comfortable&Sturdy: This durable backpack with extra large zippers, nylon straps and plastic clips. Padded shoulder straps, mesh padded back, adjustable chest straps, and top handle are provided to help comfortably carry extra heavy loads.Versatile&Large Capacity: Large deep capacity and zippered closure pockets including interior zip pocket and mesh pocket for added storage options so that it can meet your demands in daily life and outdoor camping.