A pair of Monokey Trekker Alaska side cases made of aluminum, black painted, 36 liters, with matching keys and a third cylinder that can be mounted on a top case. The Monokey mounting system allows for opening and releasing from the frame with the same key and a single lock. The cases are compatible with round tube side carriers PL_ _ _, PLR_ _ _, PLO_ _ _, PLOR_ _ _. When mounting on PL and PLR carriers, if there are difficulties in hooking onto the frame, two spacers included in the package should be installed between the tube frame and the rubber plugs.