Cardboard Postal Boxes – 18 x 12 x 3 Inch | Slim, Sturdy & Cost-Effective Packaging for Wide Parcels
The 18 x 12 x 3 inch cardboard postal box is an ideal packaging solution for businesses and individuals seeking reliable and efficient postal packaging. Designed for slim but wide items, this single wall cardboard box provides just the right balance of protection, affordability, and lightweight construction for shipping, mailing, and storing goods.
Whether you're an eCommerce seller, office manager, online retailer, or moving home, these flat-style postal boxes offer unmatched versatility and convenience.
Product Specifications:
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📦 Dimensions (L x W x H): 18" x 12" x 3" (457mm x 305mm x 76mm)
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🧱 Material: Strong single wall corrugated cardboard
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🌿 Eco-Friendly: Made from 100% recyclable and biodegradable materials
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📦 Delivered: Supplied flat-packed for space-saving storage and easy assembly
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🛍️ Ideal for: Clothing, books, printed materials, electronics, catalogues, and more
Perfect for Slim, Wide Parcel Shipping
The 18x12x3 inch box is specially suited for shipping products that are not too tall but require more surface area. It is ideal for items like laptop bags, framed prints, product catalogues, document folders, fashion accessories, and books. The shallow depth also ensures you save on postage by reducing volumetric weight—especially important for businesses using Royal Mail or courier services.
Lightweight, Durable & Postal-Friendly
Built with single wall corrugated cardboard, these boxes are strong enough to provide excellent protection while staying lightweight. This helps lower shipping costs while keeping your items safe during transit. The durable fluting inside the cardboard offers cushioning from knocks and bumps, helping to protect delicate or important contents.
The flat profile makes these boxes easier to label, stack, and manage in both warehouse and home office settings.
Flat-Packed for Storage & Fast Assembly
Each box is supplied flat-packed for efficient storage, especially helpful in warehouses or tight office spaces. When needed, they can be assembled in seconds—simply fold, tape, and you’re ready to ship. This is an excellent packaging choice for fulfilment operations or anyone needing fast and reliable parcel preparation.
Eco-Conscious & Recyclable
Sustainability matters. That’s why our 18 x 12 x 3 postal boxes are made from 100% recyclable cardboard, making them an environmentally responsible choice. Whether you're a green-conscious business or an individual seeking recyclable packaging, this box aligns with eco-friendly values and reduces waste.
Applications:
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Online retail and eCommerce packaging
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Catalogue, magazine, or brochure shipping
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Slim electronics and gadget packaging
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Clothing and fashion accessory shipments
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Office document storage and mailouts
Why Buy from Storage & Removal Boxes Ltd?
At Storage and Removal Boxes Ltd, we specialise in quality, value, and service. We offer competitive pricing, bulk discounts, and fast UK-wide delivery. Our 18 x 12 x 3 inch cardboard postal boxes are a customer favourite for their practical dimensions, durability, and cost efficiency.
Whether you're shipping 10 items a week or 1,000 a day, trust The Box Warehouse to deliver dependable postal packaging that performs every time.
✅ Order now to streamline your shipping process with professional, affordable packaging you can rely on.
Small postal boxes size:
Inches: 18 x 12 x 3″ - (3″ high)
Metric: 457 x 305 x 76 mm - (76mm height of box)
