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By Royal Appointment to HM The Queen. BSI Certified FM31516

Clear Grip Seal Bag
152mm x 229mm x 50 micron (6" x 9" x 200 gauge)
From £27.65 per 100

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M1 Expandable Cardboard Envelope

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MCEM1 M1 Expandable Cardboard Envelope

228mm wide x 294mm long (flat) / 155mm wide x 219mm long x 70mm deep (expanded)

M1 size Amazon-style cardboard envelope with expandable side gussets that can be turned into a cardboard box. Also known as a postal M-folder, capacity mailer or book box. 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	£17.94	£14.95	-
125+	25	£15.33	£12.77	-
250+	25	£12.50	£10.41	-
500+	25	£8.10	£6.75	-

M1 expandable cardboard envelope - features

Cardboard postal carton that can be sent flat as an envelope (228mm x 294mm) or converted into a box (155mm x 219mm x 70mm).
Features peel & seal strip and rip-strip for simple sealing and opening.
Corrugated cardboard provides robust protection for contents, yet is lightweight.
Innovative and flexible packaging solution - ideal for any retail business.
Adjustable length, width and depth (as width and/or length increases, depth decreases).
Perfect for sending a range of items via post or courier.
Widely used by Amazon - also known in the industry as an M-folder, capacity mailer or book box.
Suitable for Royal Mail's 'Large letter' or 'Small parcel' sizes - see below for details.
Board grade 125K/T.
100% recyclable - can be disposed of in regular kerbside collections.

M1 expandable mailer - dimensions when flat

Width: 228mm (9")
Length: 294mm (12")

M1 expandable mailer - dimensions as a box

Width: 155mm (6")
Length: 219mm (9")
Depth (gusset): 70mm (3")

Royal Mail sizing - M1 expandable mailer

When packed to a depth of no greater than 25mm, this package is classified in the 'Large letter' category on Royal Mail's Pricing in Proportion scale. When packed with a depth of more than 25mm, it is classified in the 'Small parcel' category.