Secure your One Planet Travel pack with the lockable zip sliders. Many people use small padlocks to secure these zips. Another excellent option is to use cable ties. These still act as a deterrent to petty thieves, and if customs or quarantine need to look inside your bag, they simply cut the cable ties instead of your expensive padlock. Carry a few spares for each time you get on a plane, simple.

This presents another problem, what do you cut the cable ties with now that you can't carry anything sharp in your daypack. Stash a pair of nail clippers in behind the lumbar pad of the harness on your main pack. Another deterrent if you are travelling with a top loading style pack is to use cable ties to secure the buckles. Like lockable zip sliders, it won't stop the determined criminal, but it will deter the petty thief.