C6 PiP Box (Mini Postal)
160 × 110 × 20mm — Perfect for fine jewellery, enamel pins, keychains, phone cases, watches, and gift cards.
Get a quoteCustom specifications · Personal quotation
PiP Postal BoxesCustom Printed PiP Boxes Letterbox-Friendly Postal Packaging
Slimline corrugated postal boxes engineered to qualify for Royal Mail Large Letter rates. Cut UK shipping postage costs by over 50% while delivering a flawless, full-colour branded unboxing right through your customer’s letterbox.
Your specification. Your artwork. A clear quotation.
Consider the details
What are PiP boxes and why are they essential for UK e-commerce?
PiP stands for "Pricing in Proportion" — a standard framework created by Royal Mail that calculates postage based on dimensions rather than just weight. A standard UK parcel costs upwards of £3.29 to ship, whereas a package qualifying as a Royal Mail Large Letter (maximum 353 × 250 × 25mm and up to 750g) costs as little as £1.55. QPack’s custom PiP boxes are precision-die-cut with an external depth strictly under 24mm, guaranteeing your shipments glide through standard UK letterboxes without missed deliveries, courier surcharge penalties, or Royal Mail re-categorisation fees. Starting from just 100 units with flat-pack storage and instant fold-up assembly.
- Strictly under 24mm depth — guarantees Royal Mail Large Letter postal qualification
- Saves up to £1.74 per package in UK delivery courier postage costs
- Fits through 99% of UK residential front door letterboxes — zero missed deliveries
- Ships completely flat-packed — stores compactly and pops together in 5 seconds with no tape needed
- Max Depth
- Strictly 24mm (Under 25mm)
Qualifies as Royal Mail Large Letter - Standard Sizes
- C6 (160x110x20mm) · C5 (220x160x20mm)
C4 (320x230x20mm) · Custom sizes - Flute Grade
- Rigid E-Flute (1.5mm)
White or Natural Kraft outer - Print Options
- Full-Colour CMYK (Outside & Inside)
Matte or Gloss protective varnish - Min. Order
- From 100 units
Best value pricing at 1,000 units - Lead Time
- 5–7 working days
Express UK dispatch available
Find your fit
Engineered for UK Postal Savings
Precision-engineered sizes tailored to standard UK paper sizes, flat accessories, and compact retail products.
C5 PiP Box (A5 Letterbox)
220 × 160 × 20mm — Our most popular format. Ideal for skincare kits, A5 booklets, phone accessories, small cosmetics, and scarves.
Get a quoteC4 PiP Box (A4 Large Letter)
320 × 230 × 20mm — Fits folded apparel, T-shirts, lingerie, A4 art prints, calendars, documents, and subscription kits.
Get a quoteMini Square PiP (C7 Size)
100 × 100 × 20mm — Ultra-compact postage saver for single stud earrings, rings, badges, sample cosmetics, and craft items.
Get a quoteDeep PiP Mailer (Max 24mm)
Custom width and length with maximum 24mm outer clearance — engineered for small books, games, and phone gadgets.
Get a quotePiP with Custom Fitment
Internal die-cut card insert holding fragile items (bottles, compacts, flash drives) rigidly in place without increasing depth.
Get a quoteA closer look
Why UK Online Sellers Choose QPack PiP Postal Boxes
Combining rigorous postal compliance with high-definition branding, our PiP boxes protect your margins and impress your customers.
Rigid E-Flute Corrugated Protection
Made from rigid 1.5mm E-flute board with high crush resistance — items arrive immaculate without bulk.
Full-Colour Inside & Outside Print
Turn a standard postal carton into a luxury unboxing experience. Print vibrant CMYK artwork on the exterior and a warm welcome note inside the lid.
Self-Locking Roll-End Construction
Folds together in seconds along pre-creased scorelines. Double-wall side tabs interlock securely without adhesive tape.
100% Recyclable & Plastic-Free
Manufactured from FSC-certified sustainable wood pulp. 100% kerbside recyclable, biodegradable, and printed with water-based inks.
Low MOQ from 100 Units
Order trial runs from 100 units to test new products, or scale up to 1,000+ units for massive cost-per-box volume savings.
Royal Mail Approved
Slash Postage Costs Without Compromising Presentation
Deliver straight through your customer’s letterbox. No missed delivery cards, no courier depot queues — just beautiful branded packaging that arrives every time.
From your brief to the finished result.
- 01
Share your brief
Send your product, dimensions, quantity and any artwork you have. Undecided details can be discussed.
- 02
Agree the details
Review the proposed material, construction, artwork and quotation before confirming your order.
- 03
Plan your delivery
Confirm the production schedule and delivery arrangements for your approved specification.
What dimensions qualify for Royal Mail Large Letter rates?
Royal Mail Large Letter format allows maximum dimensions of 353mm (Length) × 250mm (Width) × 25mm (Thickness), with a maximum weight of up to 750g. Our PiP boxes are built with a maximum outer thickness of 20mm to 24mm, ensuring they easily pass through the Royal Mail test gauge even with slight parcel bulging.
How much money can a business save using PiP boxes?
Standard Royal Mail Small Parcels cost approximately £3.29+ to send, whereas Large Letters cost from £1.55 (2nd Class) to £2.10 (1st Class). Sending 500 parcels a month in PiP boxes rather than small parcel boxes can save your business over £800 to £1,000 every single month in courier postage alone!
Do custom PiP boxes require tape or glue to seal?
The box itself locks together tightly using roll-end tuck tabs without any glue or tape. When dispatching to your customer, a simple branded sticker seal or 1 strip of kraft packaging tape across the front closure tab is all you need.
Can I print inside the lid of my PiP box?
Yes! Inside lid printing is one of our most popular choices. It allows you to display a welcoming brand message, thank-you note, social media handle, or QR code that catches the recipient’s eye the moment they open the box.
How are the PiP boxes delivered to me?
All PiP boxes are delivered 100% flat-packed in compact cartons. 500 to 1,000 boxes take up very little shelf or warehouse space and assemble effortlessly in just 5 seconds.
What is the minimum order quantity (MOQ)?
Our minimum order starts from just 100 units. Since setup and digital machine calibration costs are fixed, unit rates improve substantially at 1,000 units. Request a fast free quote today to compare tier pricing.
Let’s make it yours
Ready to Cut Your UK Shipping Costs?
Get a free, instant PiP postal box quote within 24 hours. Tell us your product size and quantity — we will calculate your exact unit price and Royal Mail savings.