Yes. Hefty bags and Ziploc bags are both waterproof. Do NOT use the slider seal ones... they don't seal tight like the other ones. By other ones, I mean the snap and seal ones. They protect better, because they seal tighter. If you want to put your electronic device inside to use underwater, they still work. Use one snap and seal bag and Duct Tape to seal it shut for more protection. The sound and picture may be a bit fuzzy, but it still works :)
Hefty sandwich bags are made up of polythene.
Hefty is a very reliable trash bag brand. Hefty bags are sold at many different retailers. One might purchase Hefty bags at Walmart, Amazon, Overstock, or Kmart.
There are certain models of Targus bags that are waterproof, but many of their bags are not.
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Yes, there are waterproof bags available on the market. These bags are specially designed to keep your belongings safe and dry, even in wet conditions. Visit Oasis Bags some examples of waterproof bags include Dry bags Waterproof backpacks Waterproof duffel bags When choosing a waterproof bag, it's important to consider the level of protection you need, the size and capacity of the bag, and any additional features that might be useful for your particular activity or use case.
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Biodegradable plastic.
Hefty products can be purchased from almost anywhere in the world simply by ordering them online at the Hefty website.
I presume 'Hefty' is a brand name. To me 'hefty' means 'strong', as a normal adjective in the English language. I've used them, and I think they are.
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Glad Products Company.
Some companies sell waterproof cases and they look fairly close to ziplock bags that seal food for freshness. One website you can find these cases are at cellsafe.com.