I use lots of polaroid to proof my compositions high in the Rocky Mountains. Ju st cannot live without the stuff. Soon I am planning a five day winter trip wit h tents, skiis, and 4x5 gear. Not light! I have been using hand warmers to warm my polaroid, but it an`t easy and it stinks. I even sleep with my polaroid fi lm and holder in my bag to keep it from getting cold. Perhaps some one out there has a better solution than I and would love to share it with me.... Please.