when i use to ride a bike everywhere, i kept buying in-frame pumps & they would keep getting stolen. i never needed them on the road. when i did try to use them @ home they were hard to use & were not good for high pressure tires. i found carrying $1.50 in quarters for air machines that charge to be useful. i am usually only 2-3 miles from my house. so i only carry the tool needed for something i either just worked on or keeping an eye on. I've limped home many a time. i use to carry a link tool & some links. then i upgraded to a wider chain & the tool for that looks like it would be optimus prime's nipple pincher. now with the wider chain, i have no problems. so no need to carry a tool that weighs several pounds & quite unwieldy.