FAVORITE CAMPING GADGET

I have read through probably 98% of the posts on here, and have been to multiple camping festivals. But, I am in a shopping mood, and want to know what is everyone's favorite camping gadget or item?

What is one item you have bought that you would not go camping without? It could be decorations, a solar lamp/phone charger, or even just a foldable table...

Also, what are you supposed to do until June if you have already finished all of the EForest Reading Material?!