From the Manufacturer:
Versatility is what Ziploc® Freezer Quart/Medium Bags are all about. From our Stay Open Design that makes packing up tonight’s dinner leftovers super easy, to bringing those leftovers to the office (or just about anywhere) super convenient. We know your food is an investment needing protection and as such, our Ziploc® Gallon and Quart Freezer Bags are the only bags to offer these 9 Points of Protection*.