Single use ointment/toothpaste/lotion/etc. Put it in a straw. Heat your pliers and seal it shut. Hole punch and throw on a key chain inside your first aid kit/ toiletry bag/ purse / backpack. Great for camping, hiking, or traveling.
How to take a outdoor solar light and create a rechargeable mason jar light that can be used indoors. You can use it in the evening and recharge it outdoors all day. This project could be an amazing asset in an emergency situation accompanied by a power outage. http://www.familyhomeandlife.com/2012/03/mason-jar-solar-light.html