Wholesale Card Envelope B4 255mm x 355mm 300gsm x3000

Send soft textiles, flat merchandise, and large documents as cost-effective Australia Post Large Letters using the B4 White Heavy-Duty Card Envelopes 255 x 355mm (3000 Pack Bulk). Crafted from high-density 300gsm paperboard, these heavy-duty card mailers are far thicker and stiffer than standard paper envelopes. Engineered specifically to compress soft goods flat—preventing the "inflation" common with poly mailers—their 255 x 355mm footprint sits safely inside AusPost's maximum Large Letter size limit (260 x 360mm), allowing high-volume shippers to significantly cut postage expenses.

Key Features

• High-Volume 3000-Piece Bulk Value: Commercial wholesale lot designed to maximize unit cost savings for high-throughput e-commerce brands, printers, and mail houses.

• Australia Post Large Letter Optimized: 255 x 355mm dimensions fit within the 260 x 360mm maximum Large Letter envelope guidelines, helping keep shipping fees to a minimum.

• Heavy-Duty 300gsm Cardstock: Premium 300gsm card construction provides structural stiffness and puncture protection far superior to standard 80gsm or 110gsm paper envelopes.

• Anti-Inflation Flat Profile: Tight card construction holds soft items (like t-shirts or fabrics) flat to help maintain the crucial under-20mm thickness requirement for letter rates.

• High-Tack Self-Seal Strip: Permanent peel-and-seal closure ensures rapid, tape-free packing lines while maintaining a clean, tamper-evident seal.

• Seamless Bottom Construction: Engineered with a seamless folded base to deliver maximum burst strength along the bottom seam under heavy contents.

Product Specifications

Ideal Applications

• Flat apparel dispatches, t-shirts, activewear, tea towels, and lightweight textiles

• Large B4 and A4 literature, catalogs, magazines, calendars, and marketing materials

• Art prints, photography, posters, certificates, and flat e-commerce merchandise