A hole in the bug screen is not a cosmetic problem. One tear the size of a fingernail is enough to let mosquitoes into a tent all night, and you will not find it in the dark.

These patches stick directly to no-see-um mesh and stay stuck. They flex with the screen instead of peeling at the edges the way tape does, and they are fine enough that they do not block airflow where they sit.

Worth carrying anywhere there are mosquitoes, which in practice means anywhere there is standing water within a mile.