Based on this product's specifications, here are some alternatives and similar models
Envelope MAILmedia Envirelope DIN long white with left window, self-adhesive
Summary description:
MAILmedia Envirelope DIN long is a white long-format envelope with a left-positioned transparent window and self-adhesive closure. Designed for mailing documents that fit DIN long dimensions, it ensures quick sealing without moisture. Suitable for office correspondence, invoices and business mailings, it streamlines preparation and protects contents during transit.