Master Backpack Clip Lock
I don't know why the best type of lock is the least seldom sold out there in travel-land. I find that the type of lock that is sort of like a carabiner is best because you can easily leave it clipped onto your zipper pull even when it's unlocked. I really only even lock my locks some of the time and the rest of the time they hang on my zipper pull as a deterrent - the thieves don't know if it's locked or not. Definitely always use a combination lock. The sleeker version seems to have gone away but these models do the trick.
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