I know most cyclists would just pack extra tubes but after a very positive experience with them I keep them in addition to the spare tubes. Last fall I rode over 200 miles with a friend. After driving 17 miles, I picked up a lug and my tire immediately deflated. As an experiment, he pulled out a packet of these that he had kept for years and never used. We'll find the hole and patch it as instructed. I was nervous about this solution as we had a long way to go and it seemed like a no-brainer. However, I ended the tour with a patch and he actually had to patch a tire as well. Mine lasted about 190 miles and his lasted the rest of the trip. While not as secure as a tube replacement, they give you options at a fraction of the cost for the weight and space. In addition, tire levers are also suitable for their role.
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