TSA suitcase locks

You only need them if you are flying in or out of the USA - the rest of the world doesn't have the TSA!

TSA locks are not just for the TSA. They have become a brand standard and are now marketed as "TSA Locks." It basically means they are the combination type that can be opened with a master key.

Customs people around the world are used to them and have keys.

If you want to use them, go ahead. It's a personal choice.

https://www.tsa.gov/blog/2014/02/18/tsa-travel-tips-tuesday-tsa-recognized-locks

https://www.miamiherald.com/reviews/luggage-lock/

Actually what TSA means the lock can be opened by just about anybody with a YouTube account. They don’t actually do any good. I can defeat them

They don’t actually do any good. I can defeat them

I use gate-lock carabiners on my carryon-only setup. They only take a few seconds to open but are not intended to make anything secure, just to deter prying fingers and make the bag next to mine look more appealing.

https://imgur.com/gallery/8U9W92e

I use the RS twist off flight locks. Cheap, easy, and you can readily tell if someone has been through your checked bag. Also keeps the zippers from accidentally opening during transit. Good buy.

I've used cable ties/zap straps for years.
No padlocks = no lost keys or damaged locks.
Snug the straps as tight as possible.

I always lock my bags - even though anyone with the right tools can break any padlock. The point is not stopping a determined thief - its being able to answer the question "did you pack your bags yourself and do you know what's in them" . Putting drugs in unsuspecting people's bags is a thing that happens worldwide. If the lock is gone or broken I'm clearly not answering that question!

Actually what TSA means the lock can be opened by just about anybody
with a YouTube account. They don’t actually do any good. I can defeat
them

But no one will if there is an unlocked bag next to it; and that's the point.

The cheap "TSA" locks (keyed or combination) don't really provide much security, but may be a slight deterrent to "opportunistic theft". I use them mainly to keep the zippers closed on my backpack, as in the past I've found them partially open when I reached my destination.

I don’t think some you have figured how the system worked. The TSA screens your luggage on X-ray. They see something fun in there. They tell their friends in baggage handling which bags to loot. And yes that really has happened.