Originally Posted by
Msclelovr
Unless security requirements have changed in the last few days, you can lock your bags going to the USA. But returning from the USA you must either leave the bags unlocked or, as said above, use a TSA approved padlock.
As a regular traveler to and from the US this is indeed correct.
I also lock bags with TSA approved luggage straps/locks. No problems so far in the years I've used them other than general wear and tear.