Are you ready for this one? If you want to bring a raincoat with you just in case (who believes the weather forecast anyways?), but don't want the bulk or the weight of an item you probably won't use, try this!
Bring a trash bag with you!
The bigger and tougher the better.
Turn it upside down and make a whole for your face right below one of the seams. Then, poke some holes for your arms. Finished!
This rainjacket is virtually free, and if you don't poke the holes till you need it, it can also be used for other things in a survival situation!