Plymor Heavy Duty Plastic Reclosable Zipper Bags, 4 Mil, 4 x 4 (Pack of 100)

Bags are advertised and study. They are just what I needed for my application.

I use these for samples and they have been great quality!

Excellent thick plastic that can be reused again and again. I use these to store powders and coffee when traveling or hiking.

These are great! Im using them at my wedding for our petal toss bags and they are the perfect size!

Very sturdy and thick. The zip lock is very strong.

I have a great need for these to put everything from pair of surgical gloves, face mask, gum/candy, bobby pins etc. I have 100,000 uses for these mini zip bags.

Perfect for all my jewelry at trade shows. Ill definitely be adding a Dash when I can

I love that I can use this as a way to measure snacks and not go overboard. It’s so perfect. I can now enjoy my snacks in the perfect serving size for myself

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I purchased these bags from Collecting Warehouse. I use these bags in my workshop for small quantities of hardware parts - nuts, bolts, washers, screws, etc. While I cannot comment on whether these bags are 4 mil, I can state that they are significantly thicker than the name brand zip lock sandwich bag. They are similar in thickness to the zip lock quart size freezer bags. I have no trouble opening or closing the bags as some reviewers have described. Just to be clear, I have VERY large hands, so you would think if there were an issue I would have encountered it. I was impressed with the packaging as well - I purchased a bundle of 500 bags. These came in five 100 bag zip lock bags that were clearly labeled as 100 Bags - 4x4 4Mil. This was very handy as I also ordered some 3x5 bags from the same company (I was equally impressed with those and wrote a similar review). The bags measure right at 4x4 in the usable part of the bag (which excludes the zip lock). You could put a 4x4 paper card into the bag, but it would be difficult and you could not put more than a couple inside before the bag was completely stuffed.