Reader Tony sent us this great little hack. If other readers have come up with hacks that help to carry stuff and fight theft, feel free to pass them along.
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I bought a used military ammo pouch for a couple of bucks, then took a broken SKS rear fender and removed both the front and rear part of the fender, keeping the middle part that attaches to the seat post. Then I used a piece of irregular left-over plastic from some discarded electronics and some plastic straps to affix the ammo pouch to the fender part.
Finally, I used even more plastic straps to fasten one part of a backpack buckle to the ammo pouch and the other part of the buckle to my saddle. The ammo pouch bag holds three tire levers, one small bottle of lube, a spare inner tube, a waterproof saddle cover and a set of Allen keys.
It can be attached in a few seconds and is just as easy to de-attach. This comes in handy on my commuter bike where I need to carry tools and prefer to keep them separated from my other stuff.
When I park my bike at work I bring the tools with me to keep them from getting stolen and then I re-attach the bag before I ride home. As an additional bonus, the pouch bags can be opened and closed very quickly and easily since they're made to be very user-friendly.