Well it may be a little off topic but for what it's worth...
If you are worried about punctures, I'd recommend a further two pieces for your kit that I have found very useful.
The first one is Mr Tuffy's tyre liners. Since I installed these I've not had a puncture in over two years. They're a bit fiddly to install but you wouldn't have to remove the wheel to do it. Just deflate the tube, remove one side of the tyre from the rim and install the liner. I read somewhere to taper the ends of the tube by ironing it and I would recommend this as I've had no problems.
My local bike shop recommended against the Tuffy's saying they rub the tube and cause more punctures than they prevent. Well that's not been my experience at all. I'm still using the same tubes two years later so I'd say that he didn't know what he was talking about.
I purchased these from Cell Bikes and I will put them on every bike I ever have. Well worth the money.
To iron: place the cut end of the liner between several layers of baking paper and iron with firm pressure with the iron up full power and the steam off. The rubber doesn't melt fast so don't panic. Just don't touch the rubber with the iron directly.
The other is Park Tools Super Patch (got them from
Wiggle). This is a self adhesive patch. Very quick and easy to place. Before I installed the Tuffy's I had a three inch nail drive itself right through the tread of my puncture-resistant Schwalbes and out the sidewall on my rear tyre. Two holes in the tyre and two in the tube. With two super patches I was back on the road in minutes. These days I wonder whether the Tuffy's would have stopped the nail. I hope I never find out. Incidentally, despite the holes in the tread and sidewall of the tyre, with the Tuffys in place I still use that tyre and have had no problems despite the holes. I'd say with the super patch and tuffys you probably don't need to carry a spare tube at all. I still do but I've never had to install a new one since I put in the Tuffys.
C.