I have heard about Twofish products for years but never have I actually seen them. But I stumbled on them while looking for a new pump to carry on my fat bike. Most pumps come with a cheap plastic mount that puts the pump to the side of the frame, inevitably getting in the way.
Twofish makes mounts out of a soft rubber material secured with velcro straps.
I have been using these to hold my Lezyne pump on my fat bike for the past two months with no issues at all. Easy on, easy off. Great little devices.
I see they also make mounts for locks and flashlights among other things. So if you need a better way to mount your pump, pick up some Twofish Bikeblocks. You can check them out here: http://www.twofish.biz/bike.html