several.
- you can load up on stamina food and hoof it until you run out, drop the metal, repeat.
- you can ease the terrain and use a cart.
- you can just haul what you can carry multiple times.
- you can build your crafting station on the spot and convert to gear there.
- you can kick the small 4 slot storage boxes around, and they float. limited usefulness but you can use that to put more ore on a boat (this is awesome on a karve) or to move it off a mountain (hint, hint) or to make method 1 (hoof it with stamina) work across a small body of water. These are created from breaking a cart with items in it.

not to mention many different ways to cheat the metal around, like multiple world dumpsite or mods to allow portal or just directly creating the metal in your bag.