- Free physical sample before the full run
- Free dieline and artwork check
- 6–8 business days from approved proof
Large Letter Boxes
Slash shipping costs and protect slim goods with precision-engineered large letter boxes built to maximize postal efficiency. You need crush-resistant packaging that passes through Royal Mail Large Letter slots and standard letterboxes on the first attempt. Sturdy corrugated walls safeguard delicate fulfillment items from impact without forcing you to pay bulky package rates.
Optimize your entire ecommerce packaging operational strategy with lightweight designs that fold together in seconds. Secure lock-tab closures eliminate the need for excess tape while presenting a sleek, professional aesthetic. Integrating high-quality custom postal boxes or versatile custom printed postal boxes into your mailing workflow reduces delivery rejections, speeds up doorstep fulfillment, and builds customer loyalty upon arrival.
Starting from
$0.10
per box · minimum 100 boxes
Product specifications
| Feature | Specification Details |
| Material Stock | Single-wall E-Flute or F-Flute Corrugated Board, Kraft Liners, or White SBS Liners |
| Thickness / GSM | 1.0 mm (F-Flute) to 1.5 mm (E-Flute) / 120 GSM to 200 GSM liners |
| Dimensions | Max Outer Dimensions: 353 mm x 250 mm x 25 mm (Compliant with Royal Mail Large Letter limits) |
| Printing Options | High-definition Flexographic printing, Digital printing, Offset lamination (CMYK & PMS Pantone matching) |
| Finishing & Coating | Matt lamination, Gloss varnish, Soft-touch laminate, Anti-scratch aqueous coating, Spot UV |
| Add-Ons | Peel-and-seal adhesive strips, Tear-open red rippa strips, Custom die-cut interior inserts |
| Minimum Order Quantity | 100 units |
Common questions
How do these boxes guarantee compliance with postal Large Letter dimensions?
We engineer our cutting dies to precise tolerances so the assembled box never exceeds the 25 mm depth limit. This ensures your parcels glide smoothly through postal sorting gauges to secure lower shipping rates.
Will these slim boxes protect fragile or flat items against bending and crushing?
Yes. Rigid E-Flute corrugated board provides multi-wall corner protection and high crush strength. The internal structural resistance prevents contents like cosmetics, jewelry, or books from getting crushed or bent during transit.
Can we customize the box interior to keep loose products from moving around?
We design custom die-cut cardboard inserts that lock your items into fixed positions. This prevents movement inside the box, protecting delicate goods from rattling or edge damage.
How do peel-and-seal options improve our fulfillment speed?
Integrated double adhesive strips allow your team to seal boxes instantly without packing tape. An optional tear-strip gives your customers a quick, frustration-free unboxing experience.
Can we print custom graphics inside and outside the box without increasing depth?
We offer full double-sided digital and offset printing using ultra-thin protective coatings. This adds high-definition visual appeal across all surfaces while keeping the external box profile within strict dimensional limits.
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Customization options
Customer reviews
4.8
76 ratings
4.9Print quality4.8Board strength4.7Delivery speed4.8Value4.9Support
PMPriya M.4/2/20265.0
The printed colour matched our brand proof almost perfectly — no washed-out blues like the last supplier gave us. Crash-lock base holds our jars snug with zero rattling in transit.
RARebecca A.2/14/20265.0
Third reorder now. Consistent board quality every single time and the crease lines fold clean without cracking the print.
HLHannah L.3/26/20265.0
Honestly obsessed with how the full-bleed floral print turned out. The matte board feels premium and our unboxing videos have never looked this good.
JPJames P.2/6/20265.0
Needed a small first run to test the market and the low MOQ made it possible. Quality was identical when we scaled to 2,000.
DRDiego R.3/19/20265.0
Ordered a run of activity-kit boxes with a die-cut handle and window — the finish is spotless and the kids love them. Studio sorted the dieline for us in a day.
AKAisha K.1/30/20265.0
Customer service actually replies within a few hours like they promise. They caught a bleed issue in my artwork before it went to print.
AOAmara O.3/11/20265.0
Rigid gift boxes with a soft-touch lid and printed inner — exactly the luxury feel we wanted for our candle sets. Reorder was even easier than the first time.
MVMarco V.1/22/20265.0
Sturdy corrugated that survived a rough courier journey with no dents. The FSC board was a big selling point for our eco-conscious customers.
SCSofia C.2/28/20265.0
The window box with the printed stamp detailing is stunning in person. Turnaround beat the quoted lead time and the samples arrived free before we committed.
CDChloé D.1/15/20265.0
The free dieline template made designing so much less stressful. Everything lined up perfectly on the printed box.