Clairefontaine 56020C - Pack of 20 Self-Adhesive Envelopes - Format C6 11.4x16.2cm - 120g/m² - Natural White Color - Invitation to Events and Correspondence - Pollen Range - Premium Paper : Amazon.co.uk:
A-Tech Self-Adhesive White Envelope 110 x 220mm - Pack of 25
Self adhesive Strip Postal A4C4 A5C5 Plain Self Seal Envelopes Strong | eBay
Viking Envelopes Plain C4 229 (W) x 324 (H) mm Self-adhesive Self Seal White 90 gsm Pack of 250 | Viking Direct UK
Envelope Closure Seals – All Colour Envelopes
Cardboard envelope A4, 24.5 x 34.5 x 3 cm, self-adhesive seal, tear strip, white | SPRINTIS