The Euro Asia Imports Keirin Tote is a great accessory for any track racer.  It has pockets for all your chainrings, cogs, and tools.  It will hold just about everything you need for a day at the track.  Unfold the EAI Keirin Tote and have easy access to everything you need then fold it up into a compact square and carry it home.  It comes with a laminated gear inch chart so you can calculate exactly what you need for the next race.  EAI did a great job with this product.