I got one of those cheapo 2x18650 battery cases, and use it to carry:
-spare kanger coil
-~6" 28ga kanthol
-half a pad of KGD inside a wee tiny ziplock baggie
-2mm drill bit
-SOG Crosscut multitool (has scissors instead of pliers, tweezers, and small screwdriver tools)
-bluedriver
-several different o-rings and screws from the spares that always come with attys, stored in another wee ziplock.
-spare drip tip
This should cover me for any malfunctions with my drippers, and the kanger tanks I use as backups/driving vapes. This is in addition to my usual vape-edc of 4 spare 18650s, 30ml bottle of juice, and single battery charger wall wart.
For home, I have a wee tool chest on the kitchen table that holds my wire spools, KGD, Kanger coils, o rings, and other supplies. For tools I went to Harbor Freight and got a precision screwdriver set, a set of the big tweezers (easier for bear paws to handle), some forceps, and then I already had a precision wire cutter from Craftsman. I use a cheap Tobeco ohmmeter and aluminum building jig. I do want to pick up a pair of the nylon jaw pliers, for use on stubborn 510s/top caps/buttons. I'm also considering making a mount for atomizers that's on a pivoting/locking armature with a base that clamps to the table. For now though I just build with the atty lightly screwed into a locked-out mod. A little tabletop ultrasonic cleaner would be the kangaroo's .......but then I'd be torn between using it for vapes or guns.