Bounce

I've used Bounce all over the US and can really recommend. Check out reviews from other people but most of the times their spots are really highly rated. And I've never had any issues with them!

If you want to save money, check out Stasher or Bounce. They partner with nearby hotels/shops.

Otherwise I’ve successfully used Bounce. It had a lot of locations and has large lockers, the ones I used were in train stations. I had a look and they are in Bangkok, you dont specify where you’ll be. The reason I suggest them is that I had a glitch trying to open the locker with the QR code. The online chat person was incredibly helpful and I got it sorted. I was under pressure to catch a train and I thunk getting the help you need at those times is super important.

Why not see if they offer bag storage or use a luggage storage service like Bounce?

I used Bounce, you select a local store or hotel and they hold it.