You can repair the duct tape all that is in the game and to worn condition, making any repair kits unnecessary. For example, a helmet after it was shot and it was damaged you can repair it with epoxy putty, but you can also repair with duct tape and how you can do this i don't know. Another example, suppressor what damaged after shots and only one thing can repair that it's maybe gun cleaning kit, no it's duct tape. Even a hatchet can be repaired with a duct tape, although it is obviously to repair you need sharpening stone. And there are so many examples like clothes, backpacks, weapons, some scopes and much more things can be repaired with duct tape to worn condition.