Amazon-style corrugated cardboard envelopes that can be dispatched flat as a rigid envelope, or popped out into a cardboard box. Also known as M-folders, book boxes or capacity mailers, these provide lightweight yet sturdy protection of items. Made from 100% recyclable corrugated cardboard.

• Innovative and flexible packaging solution
• Adjust the packaging to suit contents being sent
• Peel & seal strip for simple sealing
• Handy rip-strip for easy customer opening
•  Board grade 125K/T
• 100% recyclable, suitable for kerbside collections
• M1 228 x 294 long (flat) / 155 wide x 219mm long x 70mm deep (expanded)
• M2 239 x 325 long (flat) / 165 wide x 250mm long x 70mm deep (expanded)
• M3 280 x 356 long (flat) / 205 wide x 285mm long x 70mm deep (expanded)
• M4 324 x 382 long (flat) / 250 wide x 312mm long x 70mm deep (expanded)