I bought these bags from stock. I use these bags in my workshop for a small number of hardware items - nuts, bolts, washers, screws, etc. While I can't tell if these bags are 4 mil, I can say they are significantly thicker than a fastener .Zipper of well-known brand. sandwich bag. They are the same thickness as a 4 liter ziplock freezer bag. I have no problems opening or closing packages as some reviewers have described. Just to be clear, I have VERY big hands so you'd think if there was a problem I'd run into it. I was also impressed with the packaging - I bought a pack of 500 sachets. They came in five packs of 100 ziplock bags, clearly marked "100 Bags - 3x5 4Mil". This came in handy as I also ordered several 4"x4" bags from the same company (I was equally impressed with them and wrote a similar review). The pockets measure 3" x 5" in the usable portion of the pocket (excluding the zipper). You can fit a 3" x 5" index card in the pocket, but that gets tricky and you can't fit more than a few cards in before the pocket is full.
2000 Clear Reclosable 1 Inch X 1 Inch Zipper Bags By IMBAPrice
40 Review
High Quality Clear Zip Bags - 3 X 3 Inches, 2Mil Thickness, Case Of 1,000 By GPI Brand
25 Review
ClearBags 9 X 15 Door Hanger Bags (1000 Bags) For Door Knob Flyers Promotions Coupons Clear Plastic Poly Hanging Bags For Mail Newspaper Bags With Hangers Protect Against Rain, Dirt, & Bugs DK4
14 Review
Get Organized With 100 Clear Resealable Zip Bags (8"X10" 2 Mil) From Halulu
12 Review
Innovative Nifisa Honeycomb Alternative: Remarkable Cushioning for Ultimate Comfort
4 Review
๐จ Fuxury Blue Anti-Static Bubble Cushion Wrap Roll - 2 Rolls, 72 Feet Total: Protect and Secure with Air Bubble Technology!
3 Review
Honeycomb Cushioning: Eco-Friendly Biodegradable & Recyclable Wrapping Solution
3 Review
๐ Luxury Air Bubble Cushion Wrap Roll - Fuxury Bubble Roll
3 Review