C6 envelopes and C6 window envelopes are also a great way to keep your postage cost low as they fall into Royal Mails lowest postage band, as long as you dont over fill your C6 envelopes. To ensure you dont pay more than the lowest postage cost, just ensure your C6 envelopes thickness is no greater than 5mm and weighs no more than 100 grams.
To order the C6 envelopes and C6 window envelopes you require just click on one of the category options above or call our sales team on 08453 038716.