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Clear Grip Seal Bag - C4
229mm wide x 324mm long, 50 micron thickness
From £35.80 per 100

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M2 Expandable Cardboard Envelope

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MCEM2 M2 Expandable Cardboard Envelope

239mm wide x 325mm long (flat) / 165mm wide x 250mm long x 70mm deep (expanded)

M2 size Amazon-style corrugated cardboard envelope with expandable side gussets that can be turned into a cardboard box. Also known as a capacity mailer, postal M-folder 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	£20.10	£16.75	-
125+	25	£16.55	£13.79	-
250+	25	£13.49	£11.24	-
500+	25	£8.70	£7.25	-

M2 expandable cardboard envelope - features

Cardboard envelope that can be sent flat (239mm x 325mm) or expanded out as a box (165mm x 250mm x 70mm).
Convenient peel n' seal strip for simple sealing.
Handy rip-strip means simple opening for customers.
Strong yet lightweight corrugated cardboard provides robust protection for contents.
Flexible and innovative packaging solution - perfect for any retail business.
Adjustable width, length and depth (as width/length increases, depth decreases).
Ideal for sending a range of items via post or courier.
Extensively used by Amazon - also known in the industry as a capacity mailer, book box or M-folder.
Meets Royal Mail's 'Large letter' or 'Small parcel' sizes - details below.
125K/T board grade.
100% recyclable product - suitable for regular kerbside collections.

M2 expandable mailer - dimensions when flat

Width: 239mm (9")
Length: 325mm (13")

M2 expandable mailer - dimensions when expanded

Width: 165mm (6")
Length: 250mm (10")
Depth (gusset): 70mm (3")

Royal Mail sizing - M2 expandable mailer

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