0345 200 2828

By Royal Appointment to HM The Queen. BSI Certified FM31516

100% Recycled Mailing Bag
430mm wide x 600mm length, 55 micron thickness. (Medium Parcel A2).
From £36.02 per 200

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M3 Expandable Cardboard Envelope

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MCEM3 M3 Expandable Cardboard Envelope

280mm wide x 356mm long (flat) / 205mm wide x 285mm long x 70mm deep (expanded)

M3 size Amazon-style cardboard envelope with expandable side gussets that can be turned into a cardboard box. Also known as a capacity mailer, book box or postal M-folder. 100% recyclable. Boxed in 25's.

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Size diagrams Popup & zoom

Order Quantity	No. in pack	Price per pack	Price per pack	Price per 1000
		(Inc. VAT)	(Ex. VAT)	(Ex. VAT)
25+	25	£21.71	£18.09	-
125+	25	£17.87	£14.89	-
250+	25	£14.57	£12.14	-
500+	25	£10.50	£8.75	-

M3 expandable cardboard envelope - features

Cardboard mailer that can be sent flat (280mm x 356mm) as an envelope or converted into a box (205mm x 285mm x 70mm).
Handy peel n' seal strip for easy sealing.
Convenient rip-strip for simple customer opening.
Lightweight corrugated cardboard provides strong, robust protection for package contents.
E-commerce businesses will love this innovative and flexible packaging solution.
Adjustable length, width and depth (depth decreases as width or length increases).
Perfect for sending a range of products via mail or courier.
Used widely by Amazon - also known as a book box, capacity mailer or M-folder.
Conforms to Royal Mail's 'Large letter' or 'Small parcel' sizes - see below for details.
Made from corrugated cardboard - grade 125K/T.
100% recyclable mailer - suitable for regular kerbside recycling collections.

M3 expandable mailer - dimensions when flat

Width: 280mm (11")
Length: 356mm (14")

M3 expandable mailer - dimensions when expanded

Width: 205mm (8")
Length: 285mm (11")
Depth (gusset): 70mm (3")

Royal Mail sizing - M3 expandable mailer

On Royal Mail's Pricing in Proportion scale, this package meets the 'Large letter' category if packed to a depth of 25mm or less, or the 'Small parcel' category, if packed to a depth of more than 25mm.