What Ted said ^^^
You can also get pinch punctures in tubes that are too large for patching and which slime won't touch, plus of course with low pressure running you can rip the valve out of the tube (as I did in Kazakhstan).
Tubeless tyres you may be able to plug with a roadside kit, though this should really only be regarded as a get-you-home repair until it can be done permanently with a mushroom plug from inside.
For tube repairs I carry a set of lightweight alloy tyre levers from eastbound.org and the lightest 12v pump on the market from motopumps.com
The aim is to replace the punctured tube with a brand new one then repair the old item as an emergency spare until I can source another new tube.
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