I like to keep my mods in the smallest possible case, with at least a bottle of juice and enough tools to recoil / rewick the atomizer on the go. Here's the one I use for my Vaporflask:
It's an old Nintendo DS case. It contains:
- The mod - obviously
- 2 bottles of juice
- 2 spare Ni200 coils and spare cotton in an empty microSD card box
- #2 Phillips screwdriver bit for the atomizer screws
- Miniature flat screwdriver to straighten the coil's wraps
- Tweezers
- Nail clipper
- Half a plastic token to open the battery compartments (gentler on the battery caps than a metal coin)
- Drip-tip condoms to let others try my mod
With this kit, I'm all set for a day or two away from home.