evour
⏳Price
$29.99
STRBOXONG A4 Cardboard Envelopes 334 x 234 mm, C4 Rigid Stay Flat 400gsm Expandable Capacity Book Mailers, Royal Mail Large Letter with Peel & Seal and Rip & Strip Open (Pack of 10 + Stickers)
★★★★★
$29.99
Quantity
1
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About this item
- ULTRA-STURDY CORRUGATED PROTECTION: Engineered with high-density F-Flute corrugated cardboard, these strong A4 envelopes are significantly more sturdy than single-layer card. The double-sided corrugated board ensures your contents do not bend during rigorous postal sorting.
- PEEL & SEAL + RIP & STRIP: Our STRBOXONG envelopes feature a high-tack Peel & Seal adhesive strip for a permanent, strong closure. The integrated Rip & Strip Open tab provides a premium, frustration-free unboxing experience for your customers.
- EXPANDABLE CAPACITY FOR BOOKS: Much more than a flat envelope, the built-in capacity creases allow these sturdy mailers to adapt to the thickness of books, catalogues, and A4 documents while maintaining their rigid and strong structure.
- ROYAL MAIL LARGE LETTER (PIP): Specifically designed to meet PIP (Pricing in Proportion) guidelines. These sturdy 400gsm mailers help you save on postage by fitting through the Royal Mail Large Letter slot, even when using the expandable capacity for thicker items.
- 100% RECYCLABLE & BONUS STICKERS: A complete eco-friendly shipping solution. This pack includes 10 100% recyclable kraft envelopes and 10 red 'DO NOT BEND' stickers to ensure your strong parcels are handled with care by every courier.
Product details
Customer reviews
What customers say about Bigamart
10 Trustpilot reviews total, with 2 shown at a time.
Trustpilot
★★★★★
Excellent
4.5 average rating
S
Sigalit
🇮🇱 · January 2026
★★★★★
I wrote to Bigamart's customer support and they accompanied the process of reshipping the item until it finally arrived. I felt a genuine effort to solve the problem till it was finally solved.
V
Verified buyer
🇦🇺 · November 2025
★★★★★
The package was here in Australia from England in a few days — so quick! Something was missing and they refunded it straight away. Pretty happy with these guys.
Showing 1–2 of 10 reviews
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