Pro Tip: you don't die from continuing to run while out of stamina (= overweight!).

The health loss eventually stops when you have like 10% of your HP left, and you can continue running indefinitely.

In layman's terms; you don't need to stop and regain stamina if you're just trying to get back to your ship with 1000 items on you. Just sprint back and ignore the red screen tint, store all your trash treasure, then sleep in a bed to heal.

Also, you don't need to run all the way back to the ship either, you can access the cargo hold from as far as ~250m away by using Tab->Ship->F to open Cargo