New Guardian F24203 Envelopes Heavyweight Pocket Peel and Seal Window Manilla C4 [Pack of 250]

Amazon

New Guardian - A strong two-tone manilla paper that safeguards important contents and offers premium protection for important Mail C4 size Subtle two-tone sheen finish paper for better presentation Features a peel & Seal closure for a more secure seal and an extended shelf life over gummed or self Seal 250 120gsm bright white paper envelopes, for when presentation matters

Euroffice

Pocket envelopes with address window. Heavyweight 130gsm paper. Window size: 40 x 100mm. Window position: 25mm in, 213mm up. Power-Tac peel and seal closure. Easy open tear strip. Size: C4 (324 x 229mm). Colour: Manilla. Pack of 250.