C5 A5 C6 C7 DL SQUARE KRAFT BROWN ENVELOPES CRAFT MAKING CARDS PAPER WEDDING LOT | eBay
Jumbo set of folded cards and envelopes made of natural cardboard, 50 cards and 50 envelopes in square and DIN format, 100 pieces in one set, ideal to design yourself : Amazon.co.uk:
Square Blank Cards With Envelopes I White Kraft I 6x6 Square I Available in Packs of 5, 25 or 50 I Card Making I DIY - Etsy UK
Fleck Kraft 164mm Square Envelopes 115gsm (164mm x 164mm)