Dude don’t listen to them. I’m assuming you are on an Xbox or PS4.
On PC is super easy but you’ll need to Google it. (Got a slap on the wrist for giving exact details) here is a hint, It involves copy and pasting.
Here is what you do on consoles:
- Just create another character.
- Get it to sanctuary.
- On your main send every high level gun you find to the bank.
- On your mule empty the bank and sell the guns to buy back pack SDUs.
- Repeat steps 3 & 4 until your backpack storage is maxed.
Note your mule can hold 40 items plus 2 guns, a shield, and grenade mod (I think). Then repeat the above steps. For every mule you want.
Because the shared bank is 50 units it’s easy to have your mules pull out everything they need in one go.
In prior games you had no stash or it was limited to 4 items, making the multiple accounts the most efficient way of doing things.
FYI, flak looks like an old trapper / shopping cart homeless so he obviously makes the best mule.