Sleeping bag does take up some space but can easy fit it what you need. Agree with DJR, take ziplock bags with each day's riding kit pre packed in it. End of the stage, take off the dirty kit and bang in the bag. Much easier than rummaging around in the box in the ams. Remember still dark when you wake up so don't want admin. Need some warm kit too. At end of day 3, once you hand in your box, you have to still carry all your stuff that was in the box back to the car /bus so get whoever picks you up to bring a big bag.
