Properties: The 4F backpack bag will help you organize all the everyday items you always want to have at hand. The structure is made of durable and damage-resistant material. DWR or hydrophobic fabric finish. The main compartment accommodates A4 format. Carrying is made easier by the straps, which also function as a drawstring.;Properties: The 4F backpack bag will help you organize all the everyday items you always want to have at hand. The structure is made of durable and damage-resistant material. DWR or hydrophobic fabric finish. The main compartment holds the A4 format. Carrying is made easier by the straps, which also function as a drawstring.