Our folding & inserting machine envelopes are built for smooth, high-volume mailing where consistency matters. Made from 90gsm high-opacity white paper with a dependable gummed seal, they’re ideal for use in mailing departments, offices, and anyone running a folding/inserting machine.

These envelopes are engineered to reduce stoppages and keep your production line moving, while still working perfectly for manual packing when needed. Choose from DL+ or C5+ sizes, with windowed, non-windowed, and high-window options to match your printing and document layouts.

Key Benefits

• Optimised for folding/inserting machines: consistent feeding and fewer jams
• Classic gummed seal: strong secure closure for everyday business post
• High opacity paper: protects confidential contents
• Multiple window options: standard window, high window, or plain
• PEFC accredited: responsibly sourced and recyclable

Size Guide – Folding & Inserting Machine Envelopes

• DL+ windowed: 114x235mm – 90gsm – Window size: 35x90mm – Window position: 19mm from left, 18mm from bottom
• DL+ non-windowed: 114x235mm – 90gsm
• C5+ windowed: 162x235mm – 90gsm – Window size: 45x90mm – Window position: 20mm from left, 60mm from bottom
• C5+ non-windowed: 162x235mm – 90gsm
• C5+ high-windowed: 162x235mm – 90gsm – Window size: 45x90mm – Window position: 20mm from left, 72mm from bottom

Product Details

• Seal type: Gummed
• Colour: White outer & white inner
• Paper weight: 90gsm
• Seam: Outside seam
• Envelope sizes: DL+ and C5+
• Window types: Windowed, high-windowed, or non-windowed
• Eco certification: PEFC accredited materials
• For size guidance only this would replace the Pitney Bowes codes: PBENV15, PBENV16, PBENV8, PBENV5, PBENV2

Please note: on windowed envelopes there may be a 2mm tolerance in window position from the left-hand side.

Please note: due to manufacturer tolerances, actual item dimensions may vary by 10–20mm. If precise sizing is important for your project, we strongly recommend requesting a sample before placing your order.

All of our products are manufactured and dispatched right here in our own UK warehouse, which means we can offer some of the fastest turnaround times in the country. And because everything is produced in the UK (unlike many other providers), you’ll never have to worry about customs delays or surprise charges. Delivery is calculated at checkout based on order value - free over £100, from £6.95 under that or select Next Day delivery upgrade for only £9.95. All orders are shipped flat-packed for maximum efficiency.