Umpqua Bug Locker Adjustable 3412 Fly Box The Umpqua Bug Locker Adjustable 3412 Fly Box will give you a bang for your buck. The Bug Locker fly boxes are lightweight and see-through which allow for quick access to your flies and nymphs. Removable dividers included in this model allow for fishing enthusiasts to customize their fly box with up to 12 compartments. Be ready fish when the fish start biting.