Check the listing for details. Magma Bags Rolltop Backpack III Weatherproof DJ Backpack. Condition: New with tags. Listed at 199.99 USD. Weatherproof Day Bag/DJ Gear Pack from Magma Whether you're scooting around town with a laptop and camera equipment or rolling to the gig with your keyboard controller and DJ mixer, you're in good hands with the Magma Rolltop Backpack III from Sweetwater. This large all-weather daypack is built to last. Its PVC tarpaulin construction and PVC-coated waterproof zippers supply the utmost in weather stability for your gear. The RBIII is specially sized to fit the Magma Bags Ctrl-Case (not included), along with any other essential gigging gear. Top folded down, it's as compact as a standard bicycle messenger bag. Unrolled, it'll house your Pioneer DDJ or Numark NS-6 DJ controller, a 2-octave keyboard controller, or even a pretty involved pedalboard setup with no trouble.