Certain containers, specifically those made of cloth or canvas, can fold up when not in use. Thus they take up very little volume when not actually being worn. Right now the volume on the duffel bag is huge. This thing takes up almost no space when I fold it up. I often place a second duffel at the very bottom of my packed duffel bag just in case I happen to find some cool stuff to buy and need to pack it back with me.
I am all for this.
Actually the duffel should probably just have its volume reduced to its packed volume, because volume only matters when it’s in your inventory, not when worn, and if it’s not worn, it’s empty. Will change with the great containerization™