305x228x183 mm Medium Cardboard Boxes with Flaps Sturdy for Shipping | Color BROWN Kraft

305 x 228 x 183 mm cardboard box with flaps (A4 base), made from single-wall corrugated board reinforced with high-quality kraft paper. It is the best-selling postal box for medium-sized e-commerce shipments: it fits a large book, a pair of shoes, cosmetic products in a pack, or any item that needs a compact box but with sufficient depth to include protection.

What this box is used for

If you have an online store and ship medium-sized products, this is probably the box you will use most often. The A4 base (30.5 × 22.8 cm) matches the most common format in postal logistics, and the 18.3 cm height allows room for the product plus a layer of bubble wrap or void fill. It works well for books, small electronics (headphones, chargers, accessories), cosmetics, gifts, and accessories.

Technical specifications

• Internal measurements: 305 × 228 × 183 mm (length × width × height)
• External measurements: ~312 × 235 × 190 mm
• Volume: approximately 12.7 liters
• Material: single-wall corrugated cardboard, brown kraft paper
• Closure: regular slotted container (requires adhesive tape)
• Color: natural kraft brown — professional appearance without printing
• Empty box weight: ~0.25 kg

Ideal for e-commerce

The brown kraft color without logos allows the same box to be used for any brand or product. If you need customization, it accepts stickers, stamps, or printed labels well. The A4 proportion fits most products sold in marketplaces — and being a standard size, shipping rates with agencies are usually the most competitive.

If you are looking for a smaller size, we have the 228×160×102 mm (A5) postal box. And if you need something larger but equally versatile, the 37×30×11 cm postal box with lid is the next common size.

No minimum order. Shipping within 24-48 hours to all of Spain and Portugal.