Open stuck zippers
A stuck zipper is very frustrating. It feels like being locked out of your house. You know there is a space you can use, but it won’t budge even if you pull and tug from it. You may think that you’ve lost access forever.
But don’t worry, here is another problem where WD-40 is the solution. If you apply it properly, you will be able to open and close your backpack as if it were brand new. Now you can carry WD-40 inside to be ready for situations like this one.