Want to Make a Cheap, Lightweight Solar Cooker? This is an image of solar cooker "Cook Kit" Design that can be made for a few dollars out of cardboard and aluminum foil, and can be folded to fit into a backpack. Using an heat-safe oven bag (you can buy them at the grocery store for a couple of dollars, people apparently roast turkeys in them) makes it MUCH more effective. This design is one manufactured by the non profit Solar Cookers International. More info on this design can be found on their website at
http://solarcooking.wikia.com/wiki/CooKit or in their book "
Plans - How to Make, Use and Enjoy Solar Cookers". Combined with a few dollar, reusable
water pasturization indicator (WAPI), the cook kit can be used for water pasturization, useful to have around for an emergency. The book, the WAPI, pre-made solar cookers, and lots of information on this and other solar cooker designs are all available at the website of solar cookers international here:
http://solarcookers.org.