A bag that will retain heat needs to be a good insulator of heat. Clear poly bags aren't good enough at insulating heat to keep food hot for very long.
Clear poly bags can be bought in bulk from a number of companies such as Uline. The company Uline sells a number of clear poly bags in various bulk sizes.
Both poly bag pro and slideshare have information about poly bags for kids. For purchasing poly bags for kids Ebay is a great place to go. They have all types of poly bags for kids.
Use the JML Vacuum Seal storage bags. They are a great space saver, and you don't have to worry about things getting damp and spoiled, plus they come in a variety of sizes.
poly bags are just plastic bags and their mil size is the thickness of the bag, check out http://www.millersupplyinc.com/ for more info
high molecular poly bags
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Clear poly-urethane, gloss, satin, or, matt.
You can purchase multiple plastic poly bags from online retailers such as Amazon. In addition to this, you can get them from local retailers e.g. supermarkets.
Not clear question.
As far as facts the best website would be MillerPolyBags.com for factual information about poly products.
If anything is disposed of improperly or carelessly, it can cause problems. My problem with the disposal of plastic bags and poly bags has more to do with how it is being disposed as opposed to what is being disposed. Unfortunately, there is a lot of chatter concerning the banning of plastic shopping bags and poly bags. I think this is a very bad idea. It will destroy US jobs. Less than 1% of all plastic waste in landfills is attributed to plastic bags. We put more plastic based products into our bags at the supermarket than the plastic bags themselves. Reusable / recyclable bags are the only answer along with strict recycling laws. You can purchase a wide array of plastic bags, paper bags, poly bags, shopping bags, grocery bags, non woven tote bags at http://isellpackaging.com
The zipper bags are always suggested due to the fact that they seal air tight. Also they should be at least 1/2 gallon in size in order to store everything effectively