For a weekend out visiting family or friends I use
Large Zipper Bag | Cumberland Concepts
I found it at a local Wal-Mart for 4.50. It has a respectable liner that is water resistant (or juice for that matter) It's easy to wipe off.
Example of what I have carried (I use little zip lock bags to stow my gear in before I throw it in there)
Extra Cotton, 4 18650 batteries in a 4 slot case, tweezers/Ceramic, wire snips, small drivers for wrapping/RBA screw removal 22 and 28g Kanthal spool, 3-5 tanks and my Magma RDA and I usually bring 3 bottles of 15ML juice. It's reasonably roomy

Could easily throw one of my spare single 18650 mods in there and have a touch of room left.