PABCK Stand-Up Resealable Heat Seal Bags 3.55mil Thick Mylar Frosted Black Foil Sealed Bags 50 Pieces 3.35x5.1 inch for Zip Packaging Lock Food Storage Pouch

These are exactly as pictured. Very high quality. Beautiful, in fact. They are a little hard to open the first time, which means to me that the seal is secure. They make a reassuring click when re-closed. What I didn't understand when reading the description is that the dimensions are the full exterior dimensions, making the usable interior capacity approximately 3 3/4 x 4. They open to approximately an inch at the bottom. You'll need labels to identify contents as a pen will not write on them and a marker may smudge.

These bags are thick and sturdy, but small. They're good for storing items that have a lot of hard edges that would normally poke through other types of plastic. They stand up making them easy to fill. The zipper seal opens easily when pulled apart. I haven't had any of the zippers fail though. When closing them, they line up perfectly and you can feel it sealing as you run your fingers across it.

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