This handy holder is the ideal way to pack calories for long bike rides. Next time you need to fuel up, skip the gel and enjoy a doughnut instead. 

Compatible with Franz Old Fashioned Donuts.

See it in action:

The two shells connect via 12 cylindrical magnets (6mm dia, 2.8mm h). Insert the magnets with the north and south poles alternating. This causes the two shells to pop apart when twisted.