Review on SC Johnson Professional ZIPLOC Storage Bags: Double Zipper, 2 Gallon, 100 Count - Ultimate Food Organization and Storage by Lorenzo Moulton

Hawaii will ruin your books. I was happy to find these bags in these sizes because they fit a standard size textbook and still have room. It made it very easy to protect my books. I use 2 packs per book. Can't comment on the leak etc for food use. They're not exactly "heavy" in terms of thickness, but they're not thin either. The description says these are storage bags, not freezer bags. It will take years to run out of 100 bags but when they run out I will order again.