The Wild River Multi-Tackle Small Backpack features a lower tray compartment for storage of up to four #3500 style trays. In addition, upper storage area with removable divider, converts backpack for storage of larger items. A front pocket that folds down to provide a handy work surface and large adjustable padded shoulder straps for all day comfort. This backpack holds up to four #3500 or two #3600 style trays with the divider down.