S = 70 lb (50-pack), M = 80 lb (50-pack), L = 80 lb (250-pack). These A2 square flap envelopes work well for announcements, RSVPs, thank-you cards, save the dates, invitations, holiday cards, direct mail, letters, and postcards. Traditional moistenable adhesive allows quick sealing with an envelope moistener or by moistening the strip and applying pressure. Compatible with commercial, digital, and offset printing presses for custom logos and branding without smudging or jamming. Made from 70 lb. text-weight paper stock, about twice as thick as standard paper with a woven texture, available in multiple color options. Heavyweight paper stock with side seam construction ensures thickness and durability for photos, letters, mailings, and invitations. Weight: 0.44 pounds.