I've got one of those sealed bins on wheels that fits under one of the seats. I've packed almost every tool I could think of in it and also the tapes etc, what Azza said about the silica bags works great with xmas coming they seem to appear in a lot of boxes especially electrical gear so grab them they work great I keep them in tools, I also keep a bag of different batteries D cell Cell etc with one of the bags in them. Another thing i've done is get some lighting that works with batteries for emergencies allround light for anchoring runs off batteries rather than use my main one its a led so they last for ages. My missus also put in a number of towels cheap one she bought at a $2, shop they come in real handy for all sorts of things.