Originally Posted by
nbs2
I realize that my method isn't as secure at locking the carryon - but in cases where the locking isn't feasible (like a diaper bag)
I'm missing something here -- why would one lock a diaper bag? Or maybe you're suggesting a case where one would be tucking their wallet/ID in to a diaper bag? In that case, even a velcro pouch secured to the shoulder strap would be both practical and unobvious a place to stash small valuables.
or a lock just isn't handy
It's not difficult to plan for handy-ness.

A small combo lock can be stashed in its opened/unlocked position in an interior or exterior pocket of the bag until needed for use. If you're nimble with one hand, leave the lock on an exterior zipper so it's never lost and just the set the last dial two digits removed from it's unlocked position.
The thread does have me thinking maybe I'll go invest in some zip ties to augment my disappearing small combination lock collection.
I have reusable zip ties. Sounds like a misnomer but really if you're just looking to stall having your bag opened then that's all you really need. And that's all a lock really buys you -- a delay tactic.