I have used a backpack with good results, you can fit a couple 3600's in there and bunch of soft plastics, in the smaller pouches you can put your scale/pliers/etc in.
Many other choices out there like 3600 size duffle bags, or even a 3700 sized bag where you can cram 3600's in.
I like to use the 3600 Thin plano boxes for their compact bodies.