3 interior mesh organizer compartments; Boot/laundry chute expandable compartment; Exterior access pockets; Four 3X thickness webbing handles; Double straps to carry as backpack; Singe strap attached for over-the-shoulder or sling carry; Wide access main compartment opening; Top mounted straps so clean side of duffel wears on your back; Geometric design to stack multiple Squadron 40L's; Closed cell foam bottom insert for shape and protection