Based on this product's specifications, here are some alternatives and similar models
BSTech PollyMailers B4 Mailing Bags 260x350mm 50 Microns 50 Pieces
Summary description:
BSTech PollyMailers B4 mailing bags are durable, moisture-resistant shipping envelopes designed for secure parcel delivery. With a size of 260x350mm and a thickness of 50 microns, these opaque plastic bags provide excellent protection for documents and small items. This pack contains 50 units, making them an ideal solution for e-commerce businesses and logistics needs requiring reliable, lightweight packaging for daily shipping.