. PLANO 3700 Guide Series Hydro Flo Tackle Bag features a topside Utili-tackle rail system that holds a 3700 stowaway utility box for quick access, Hydro-Flo base with elevated rubber feet and ports to drain water, an Utili-tackle rail system which includes 17 accessory attachment points, tie-down slots, clear zippered pocket inside lid, collapsible zippered side pockets with external tool holders, large zippered front pocket with hdpe d-rings and mesh slip pocket, and a large rear mesh slip pocket.bag dimensions are 21” x 14” x 14.5”