In order to facilitate the essential plan B,

-downsize the messenger bag; it's possible to buy bags in stores in cities all over the world, and you can see/touch/measure them yourself

-either carry less electronic gadgets on trips or put the most durable items in the checked bag

This advice applies equally to American, Delta, and JetBlue, so there is no reason to fish for different answers in other forums.

Furthermore, it is not rocket science; millions of people figure it out on their own every day.