I have 3 kits going at all times -- my carry case with my Riva 510, extra Riva batt, 5 cartos, 1 atomizer with drip tip and 1 5 ML bottle. This is my "day kit"
I keep the box my eGo starter kit came in at home upstairs in the liquor cabinet. I keep a few extra cartos, syringe, and my juices (I only have a half-dozen bottles at any one time) in this and I stand it on end so the bottles are upright. This is my "night kit" for refilling cartos, etc.
In the basement I have a small old toolbox with my backups -- 2 eGo batts, charger, lots of unused cartos, lots of juice I didn't like and am saving to mix flavors and try to salvage, extra attys, my old RN4081 stuff, etc.