Product review (5 stars): bigger than I expected.
As with the smaller mylar bags I ordered, these are working out so much better for my purposes than I could have thought possible. They actually hold more than I thought they would. I have sealed up complete 50 lb. bags without having to empty the contents or divide it up between two of these 20"x30" mylar bags.  And I still had room left when I sealed them up. Going to put some more of these on my next shopping list. Thanks.