Two words. Crystal Light.
Occasionally we buy one of those tubes of Crystal Light that contain those little tubs that makes a pitcher of the stuff. I’m super partial to the Strawberry Orange Banana, but that’s not important right now. It’s all about the container.
Remove the label and you have the world’s lightest sunglass case. If you’re like me and have prescription sunglasses, you need a safe haven for whichever pair you’re not wearing. Put a small roll of TP in a zip lock bag and you have padding that both protects your lenses and keeps the glasses from bouncing around and driving you crazy on the trail.
I’m warning you right now the glue they use on the labels is a certified bitch to get off. If you ever find another product with the same type of tube, let me know.