I really like the straight and clean style of fixie bikes. No unnecessary gimmicks... just reduced to the minimum.
This spartan equipment might bring problems how to transport stuff on a bike. It seems a handlebar provides volume which hasn't been used yet! In this 3d printed "Handlebar Pocket" you can stow small things like medication, plasters, paper money, batteries or even repair stuff for your bicycle! There are a lot of small and needful things you might be happy to have at hand during a ride. Use the volume of your handlebar to carry them. Object length can be up to 78 mm.
In addition to the 3d printed parts, you need a screw and a bolt to mount the "Handlebar Pocket". It should fit on most straight 22 mm handlebars. The inside diameter has to be 19.5 up to 20.5 mm. The straight part of the handlebar should be at least 110 mm long.