Buy Bulk Board Backed Envelopes | Wholesale Quantities

Looking to buy board backed envelopes in bulk? At Defendapack, we supply high-quality board backed envelopes in wholesale quantities for businesses, online sellers, and offices that ship artwork, documents, or photographs every day. Available in sizes C3, C4, C5, and C6, our rigid envelopes feature strong backing boards to keep contents flat and crease-free in transit. Ordering in bulk means you get the same premium quality at discounted wholesale prices, with fast delivery anywhere in the mainland UK (extra charges apply for highlands and islands).

Why Choose Bulk Board Backed Envelopes from Defendapack?

Strong & Rigid Protection

Each envelope is made from durable manilla or white board to ensure maximum rigidity and protection for your printed materials, certificates, and artwork.

Cost Savings for Bulk Buyers

Our bulk pricing structure is designed for high-volume users. The more you buy, the lower the cost per envelope — perfect for mailrooms, print houses, or fulfillment centres.

Eco-Friendly Options

Choose from FSC-certified and recyclable materials, helping your business stay sustainable while maintaining strength and quality.

Consistent Supply

We stock large volumes across all standard envelope sizes — ensuring reliable availability for your ongoing mailing requirements.

Available Bulk Envelope Sizes

394mm x 318mm (appx 15.5″ x 12.5″) Board Backed Envelopes

Price range: £21.75 through £241.00

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444mm x 368mm (appx 17.4x 14.4″) Board Backed Envelopes

Price range: £24.75 through £287.50

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C3 / A3 Board Backed Envelopes (457mm x 324mm 18″ x 12.75″ appx)

Price range: £10.25 through £446.21

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C3 / A3 Board Backed Envelopes With STIFFENERS (457mm x 324mm 18″ x 12.75″ appx)

Price range: £18.50 through £312.12

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C4 / A4 Board Backed Envelopes (324mm x 229mm 12.75″ x 9″ appx)

Price range: £1.00 through £425.50

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C4 / A4 Board Backed Envelopes with STIFFENERS (324mm x 229mm 12.75″ x 9″ appx)

Price range: £19.25 through £179.50

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C4 / A4 LIGHTWEIGHT Board Backed Envelopes (324mm x 229mm 12.75″ x 9″ appx)

Price range: £20.38 through £116.85

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C4 Tariff Beater Board Backed Envelopes (324mm x 229mm 12.75″ x 9″ appx)

Price range: £22.75 through £112.75

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C5 / A5 PiP Board Backed Envelopes (238mm x 163mm 9.37″ x 6.42″ appx)

Price range: £0.51 through £372.40

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C5 / A5 PLUS Board Backed Envelopes (241mm x 178mm 9.5″ x 7″ appx)

Price range: £0.58 through £478.75

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C6 / A6 CLASSIC Board Backed Envelopes (162mm x 114mm 6.37″ x 4.48″ appx)

Price range: £0.43 through £462.50

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C6 / A6 PiP Board Backed Envelopes (190mm x 140mm 7.48″ x 5.5″ appx)

Price range: £0.47 through £307.50

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Photograph Size Board Backed Envelopes (267mm x 216mm 10.5″ x 8.5″ appx)

Price range: £16.99 through £329.00

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Small Parcel Size Board Backed Envelopes 449mm x 349mm (17.6″ x 13.7″)

Price range: £34.50 through £318.40

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WHITE C3 / A3 Board Backed Envelopes (457mm x 324mm 18″ x 12.75″ appx)

Price range: £26.25 through £565.40

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WHITE C4 / A4 Board Backed Envelopes (324mm x 229mm 12.75″ x 9″ appx)

Price range: £28.25 through £162.50

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WHITE C4 / A4 Board Backed Envelopes WITH WINDOWS (324mm x 229mm 12.75″ x 9″ appx)

Price range: £16.25 through £168.50

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Fast UK Delivery on Bulk Orders

We know timing is critical for businesses. All bulk envelope orders are packed securely and shipped via reliable couriers for prompt delivery across the UK. Need a custom size or branded envelope? Get in touch — we can quote for bespoke board backed envelopes with printed logos or return addresses.

Ideal For

Printers and graphic designers shipping flat artwork
eBay, Etsy, and online sellers sending photos or documents
Offices and mailing houses dispatching certificates or letters
Universities and schools posting diplomas and certificates