i bought the normal travel locks from the standard bag shops, but i bought the combination ones NOT ones with keys. They are lightweight and and pretty strong also they will fit 99% of lockers around the place. you really wont need much more than that. every place we stayed in was really safe! the only things is just dont leave stuff lying around that you dont care about. and honestly i used the locker in london, but not in a single other place while on tour! i just made sure my suitcase was locked. you only share with out topdeck people and you need keys or swipe cards to get into the rooms. Not a single person has anything stolen on the whole trip.
any other questions you guys have, just let me know