Looking for a large letter envelope to maximise the Royal Mail large letter size limit of 353 x 250 x 25mm? The Lil A3 is a large letter mailer featuring in our cardboard envelope range. This mailer is perfect for delivering A4 brochures, calendars, DVDs, photos, photo frames and more through the postal system. With its attractive 'kraft' finish, customers will open this effective packaging to receive their products in the condition in which they ordered them. The A3 large letter envelopes are made from very stiff 450 gsm material with specially designed folds to provide impact protection around the edges minimising the risk of impact damage. The envelope features our leading peel'n'seal / tear-strip system for easy sealing and opening.