The Oyster suitcases have an odd taper to them. They were the suitcase of choice for the Bike Friday perhaps 20 years ago. It is a tight fit. I haven't seen any official instructions, but I usually pull both wheels, remove the pedals, and split the handlebars, then start packing. I can get the whole bike in the suitcase. Technically the trailer frame and wheels are also supposed to fit inside with the bicycle, but I've never quite gotten it that tightly packed.