Custom Letter Box
A custom letter box is a slim, flat mailing box designed to fit through standard mail slots and letterboxes, eliminating the need for in-person delivery. Made from sturdy, lightweight cardboard or kraft paper, it’s perfect for shipping small items like books, documents, jewelry, cosmetics, or samples. Businesses often customize these boxes with branding, colors, and logos to enhance professionalism while ensuring products arrive safely and conveniently.
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Letterbox-Friendly Size – Slim design that fits through standard mail slots, no need for recipient signature.
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Custom Branding – Fully printable with logos, colors, and graphics for professional presentation.
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Lightweight but Strong – Made from durable kraft or corrugated board to protect contents while keeping postage low.
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Eco-Friendly Options – Recyclable and biodegradable materials available.
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Versatile Uses – Ideal for books, documents, jewelry, cosmetics, subscription kits, or product samples.
Product Overview
Our custom letter boxes are slim, flat mailing boxes designed to fit directly through standard mail slots and letterboxes, eliminating the need for in-person delivery. Lightweight yet strong, these boxes offer a cost-effective and eco-friendly packaging solution for small items such as books, cosmetics, jewelry, samples, and subscription kits.
Made from premium kraft paperboard or corrugated cardboard, they ensure protection during shipping while keeping postage costs low. With full branding and customization options, your business can transform a simple mailer into a professional, memorable unboxing experience.
Whether you need eco-friendly letterbox packaging, branded letter mailers, or wholesale letter boxes, we offer scalable solutions tailored to your needs.
Core Selling Points
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Letterbox-Friendly Design – Slim profile fits through most household mail slots, enhancing delivery convenience.
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Strong Yet Lightweight – Protects items while minimizing shipping weight and costs.
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Custom Branding – Add logos, colors, graphics, or inside printing to create a memorable unboxing.
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Eco-Friendly Options – Available in recyclable, biodegradable, and FSC-certified materials.
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Reduced Delivery Costs – Compact design saves on postage and avoids missed deliveries.
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Professional Presentation – Enhances perceived value of your products and boosts customer satisfaction.
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Flexible Order Quantities – MOQ as low as 100 units, scalable up to enterprise production.
Application Scenarios
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E-commerce Brands – Perfect for online shops delivering small products to customers’ doorsteps.
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Subscription Services – Ideal for flat-pack monthly boxes containing samples, cosmetics, or accessories.
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Book & Magazine Delivery – Safely ship novels, journals, and zines without bulky packaging.
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Fashion Accessories – Jewelry, watches, or small apparel shipped in branded letter boxes.
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Cosmetics & Skincare – Slim beauty boxes for creams, serums, or sample packs.
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Corporate Gifts – Branded flat mailers for gift cards, small kits, or marketing campaigns.
Customizable Options
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Size & Shape
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Standard letterbox dimensions
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Custom sizes available for specific products
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Materials
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Kraft paperboard (eco-friendly, natural look)
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Corrugated cardboard (lightweight but protective)
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Rigid board (premium option)
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Printing & Branding
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CMYK full-color printing
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PMS spot color matching
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Foil stamping, embossing, UV coating
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Inside and outside print options
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Finishes & Add-ons
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Gloss, matte, or soft-touch lamination
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Peel-and-seal adhesive strips for secure closure
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Tear-open perforation for easy unboxing
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Inserts, dividers, or protective wrapping
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Technical Specifications
| Feature | Options & Details |
|---|---|
| Materials | Kraft, Corrugated Cardboard, Rigid Board |
| Printing | CMYK, PMS, Digital, Offset, Foil, UV |
| Sizes | Standard letterbox sizes + fully customizable dimensions |
| Thickness | 1.5mm – 3mm (depending on material) |
| Closure | Peel-and-seal strip, tuck-in flap, or adhesive closure |
| Eco Certifications | FSC-certified, Biodegradable, 100% Recyclable |
| MOQ (Minimum Order) | From 100 units |
| Production Time | 10–15 business days (bulk orders negotiable) |
| Shipping | Global delivery with cost-effective logistics |
Comparison: Our Custom Letter Boxes vs. Other Packaging
| Feature | Our Custom Letter Boxes | Plastic Mailers | Standard Shipping Cartons |
|---|---|---|---|
| Mail Slot Compatibility | ✅ Fits through standard slots | ❌ Too bulky | ❌ Requires doorstep delivery |
| Eco-Friendliness | ✅ Recyclable & biodegradable | ❌ Non-biodegradable | ✅ Recyclable but oversized |
| Branding Options | ✅ Full-color custom printing | ❌ Limited customization | ❌ Plain or basic branding |
| Cost-Effectiveness | ✅ Saves on postage & delivery fees | ✅ Lightweight but not protective | ❌ Higher shipping costs |
| Customer Experience | ✅ Professional, sleek unboxing | ❌ Cheap, flimsy appearance | ❌ Generic, uninspiring |
Call to Action
Frequently Asked Questions (FAQ)
Q1: What can custom letter boxes be used for?
A: They are perfect for books, magazines, cosmetics, jewelry, accessories, subscription kits, and other small items.
Q2: Are these boxes accepted by postal services?
A: Yes. They are designed to meet standard letterbox slot sizes, making them postal-friendly.
Q3: Can I order eco-friendly materials?
A: Absolutely. We offer recyclable kraft paper, biodegradable cardboard, and FSC-certified options.
Q4: Do you offer wholesale pricing?
A: Yes. We provide bulk order discounts for large quantities, making them ideal for e-commerce brands and subscription services.
Q5: What’s the minimum order quantity?
A: The MOQ starts at just 100 units, with scalable production for larger businesses.
Q6: Can I print inside the box as well?
A: Yes. Inside-outside printing is available to create a more immersive unboxing experience.
Q7: How long does production take?
A: Standard turnaround is 10–15 business days after artwork approval. Rush orders may be available upon request.
SBS C1S
glossy, smooth-coated surface on one side, ideal for high-quality printing.
SBS C2S
glossy, smooth-coated surface on both sides, ideal for high-quality printing.
Brown kraft paper
durable, eco-friendly material made from unbleached wood pulp. Known for its strength and natural, rustic appearance.
CCNB
One side coated and grey colour on another side, eco-friendly, fully recycled.
White kraft paper
strong, durable, and eco-friendly paper made from wood pulp, clean, bright white appearance.
3 layers corrugated paper
1 fluted layer sandwiched between 2 flat linerboards, Ideal for small boxes, retail packaging, and mailers, Perfect for shipping lightweight items like clothing, books, or cosmetics
5 layers corrugated paper
2 fluted layers with 3 flat linerboards. used for international shipping carton packaging, cardboard display stand.
7 layers corrugated paper
3 fluted layers with 4 flat linerboards. Used for crates, pallet boxes, and bulk shipping containers.
Get your artwork files ready for submission by following our Artwork Guidelines and the details provided below. Need assistance with your artwork? We’re here to help! Take advantage of our free design support and mockups to ensure your final product matches your vision perfectly. Just reach out to our packaging experts!
Cut Lines
Indicate the exact path where the packaging will be cut to its final size. These lines are usually solid and are used to trim the material.
Fold Lines (Crease Lines)
Mark where the material will be folded. These lines are often dashed or dotted, guiding where the cardboard or paper will be bent to form the box.
Perforation Lines
These are dotted lines that define where small holes are punched into the material. Perforation lines allow for easy tearing, which is often used for coupons, product access points, or removable parts.
Bleed Area
This is the area extending beyond the cut lines where the artwork or design elements are placed to ensure that there are no white edges when the packaging is cut. Artwork is extended into the bleed area to avoid unwanted gaps in the final product.
Safety Margin
A buffer zone inside the cut lines where no critical text or artwork should be placed. This ensures that important elements aren't cut off during the trimming process.
Registration Marks
Small marks outside the cut lines used to help align the printing plates and ensure colors are printed accurately and consistently.
Get Your Custom Packaging Box Style
Check out our selection of curated retail packaging boxes to find the perfect solution for your business. no matter you need folding carton, rigid box or corrugated box style,you can get all different custom packaging boxes style from Colorfulpack. If you have any questions while browsing our custom box options, our team is ready to assist you.
Get a Quote
Show us the packaging box style you like and tell us the specifications of the custom packaging box you need, such as dimensions, quantity, color printing, surface finishing ect. it would be great if we can have your artwork to check and quote.
Dieline and Artwork
When quotation accepted, we will send you diecut line to prepare your artwork for your custom packaging,make sure the artwork is correct before printing. you can check our artwork guideline before creating your artwork.
Sample Production
After we get your sample payment and artwork, we will start to make your custom packaging box, normally it will take around 7business days to finish it, and we will send it you by express such as Fedex, UPS, DHL ect.
Bulk Order Production
When you get your custom packaging sample, you check the sample by yourself. we will proceed with bulk production when we have your confirmation. any modifications can be made before bulk production, you can tell us if any modifications at this stage.
Shipping
We will deliver your custom packaging boxes to the designated location, you can also ask your freight forwarder to pick up the goods from us.
Get Free Quote of Custom Letter Box
🚀 Upgrade your packaging with custom letter boxes that combine convenience, protection, and branding in one smart design.
👉 Request a Free Quote Today and start delivering your products with style, sustainability, and cost savings.
