which size is a4? c4?

The 'A' prefix is the paper size; the 'C' prefix is the envelope size. A4 paper fits unfolded inside a C4 envelope (similarly A5/C5, A6/C6, etc).

What is the gsm of both the paper and the board? Want a thick board back that won’t easily bend

I don't know what the gsm is but I found them pretty sturdy and sent photos using them.

would my card 160cm x 155cm fit in this envelope

Yes the envelopes are 229 x 162 so your items would fit.

Will this fit a A3 print?

Yes. I use it to fit A3 booklets.

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Blake Purely Packaging C3 (A3) 450 x 324 mm Board Back Pocket Peel & Seal Envelopes (4200/50) Manilla - Pack of 50

Product ID: 60377604

Details

Brand
Blake
Closure type
Self-Seal
Colour
Manilla
Material
Cardstock
Occasion
Envelopes

📏450 x 324 mm C3 size

🔒Strong peel & seal closure

🛡️Heavy duty board back protection

₪499

Duties & taxes included

In stock

Sold byAmazon IsraelDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Israel.

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Description

📬 Seal your success with style and security!

CLEAR DO NOT BEND WARNING - Printed front message adds an extra layer of care during transit, reducing risk of damage.
GENEROUS C 3 SIZE FOR VERSATILITY - Spacious 450 x 324 mm dimensions accommodate large documents, cards, and artwork with ease.
ULTIMATE PROTECTION FOR YOUR MAIL - Heavy-duty board back shields certificates, photos, and prints from bending or damage.
ECO FRIENDLY PROFESSIONAL MANILLA - Classic manilla color offers a premium, lightweight, and sustainable mailing solution.
EFFORTLESS SECURITY WITH PEEL SEAL - Strong self-adhesive closure ensures tamper-proof sealing and quick, mess-free use.

Blake Purely Packaging C3 Board Back Envelopes (450 x 324 mm) combine robust cardboard backing with a strong peel & seal closure, ensuring your important documents and prints arrive pristine. With a clear 'Please do not bend' warning and a professional manilla finish, these envelopes offer reliable protection and effortless mailing for business and creative needs. Pack of 50, trusted by thousands for durability and value.

Specifications

ASIN	B00O4X7W00
Best Sellers Rank	16,512 in Stationery & Office Supplies ( See Top 100 in Stationery & Office Supplies ) 174 in Envelopes
Brand Name	Blake
Closure Type	Self-Seal
Colour	Manilla
Customer Reviews	4.6 4.6 out of 5 stars (2,308)
Global Trade Identification Number	05055559753087, 05055559719472
Item Dimensions L x W	45L x 32.4W centimetres
Item Shape	Rectangular
Item Type Name	Purely Packaging C3 450x324mm Board Back Envelope Box of 50
Item Weight	2.49 kg
Manufacturer	Blake Envelopes
Material Type	Cardstock, Paper, Cardboard
Model Name	Everyday - Board Back Envelopes
Number of Items	50
Occasion	Envelopes
Occasion Type	Office, Envelopes, Arts and Craft, Mailing, Business
Recommended Uses For Product	Office, Letter, Envelopes, Invitation Card, Business
Size	C3 450 x 324 mm
Special Features	Board, Self-Adhesive Closure, Lightweight, Premium, Card
Style	Pack of 50 (No Window)
Unit Count	50.0 count

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