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Used these to send glass jars across the country and every single one arrived intact. The double track zipper held up perfectly during transit and the 3.6 mil bubble layer really absorbed the bumps.

I was worried about shipping fragile components, but the double track zipper on these really keeps the seal secure and the 3.6 mil thickness feels reassuringly strong.

Finally, a ziplock bag that actually stays sealed—the double track zipper snaps shut with a satisfying click every time. I used these for shipping ceramic mugs and the 3/8" bubble cushioning kept them safe through a cross-country trip.