Something else you might want to keep in mind... If you are using soft luggage with 'self-repairing zippers' you can't protect your gear even if you lock it with a Kryptonite U-Lock unless they lock TO the suitcase and can't move. That is because of the nature of the self-repairing zippers.
Imagine... you've brought your two zippers together in the middle or at the top of your bag and locked them together. No way to separate them, right? No need to. Just slide them to the end of the zipper track out of the way, and with a pen or pencil, push through the zipper in the middle of the bag, spreading the zippers wide open. After rummaging though everything, fold the bag together, and run the tightly locked zippers back over the opened bag to re-seal/'repair' the zippers. Voila! A closed, locked bag looking for all the world as if it's secure.
Some suitcases have a locking station that the tabs of the zippers lock into so the two can't move around the bag. That helps.
Stitchawl