I put it in a box - taxis from the airport to cheap hotels in Rawalpindi are peanuts, and the hotels will store your boxes for free. Usually, I don't bother with a box -- too much hassle at either end. Bike transport on buses in Pakistan is also easy - you'll pay a small surcharge to stash it on the roof - it's worth taking the bus to Gilgit to get past some dodgy tribal areas, then let it rip on the big stuff. Woohoo!

Pete's Website - http://homepages.tesco.net/~Peter.A.Jones/