Backpacks Backpack First Day Pack, 18 l. FDP-B Backpack UTactic First Day Pack – it’s a day pack with 18 liters of overall capacity, can be putted on as a sling backpack using one shoulder strap or as a classic backpack with two shoulder straps. If you want to wear your backpack in the ‘sling’ mode, you need to draw tight one of the side straps located on central fastening, the other side strap can... View