I haven't used it yet but it seems more than enough for this purpose. Based on an article I once read about cycling emergencies, I always carry Mylar granola bar wrappers in my bag for this purpose. The only time I've ever tried that, it didn't work. The tube is pushed out. I think there is a limit to how big a cut will work. I tried patching some tires with tube patches. Again, there's a limit to how well this works. I have two almost new Michelins with holes in the sidewalls of the tires. One hole was bigger than the other. Using a patch on a small hole (like a pin hole, only bigger) worked really well. The other hole was more like a hole - maybe 1-2mm. I see a slight bulge in the plaster trying to stick. These patches are thicker than tubular patches and have an adhesive on one side. Haven't tried patching a second tire with it yet. Wisconsin is here - the bike season is almost over. I'll update this when I do. I suspect this section is thick enough that you can get to the house even if it was a little open. I once had to do an emergency stop for a dump truck (his right of way is my bad one). I was in the airbar, grabbing the left brake and slinging the tire until it popped. The actual hole was about 1/4" x 3/4" - and of course there was thin material around it. Too much for a mylar sheet. If I had brought one of these I probably would have at least made it home. If I ever need to use it in a real emergency I will update this list. In the meantime, these patches give me that extra confidence that I can handle most situations I encounter on the road.