Are these suitable for a heavy book (5 or 6 lbs)? Thanks.

Depends on shape and thickness of book. I would use a poly mailer instead as a heavy book could split the seams of mailer and potentially fall out.

How much does one mailer weigh?

Not sure of the weight but I used them to mail portrait packages with 3 8x10’s in each stay flat mailer. The least expensive method to mail was 1.67 through USPS

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📬 Ship Smart, Stay Flat, Impress Always!

EFFORTLESS SECURITY - Peel-and-seal adhesive strip ensures tamper-resistant, moisture-proof packaging every time.
STAY FLAT PROTECTION - Rigid chipboard design keeps documents and artwork perfectly flat—no bending, no extra fillers.
VERSATILE BULK PACK - 100 mailers per pack—ideal for scaling small business shipping or creative professional needs.
USPS CARRIER READY - Meets USPS First Class, Priority Mail, and commercial carrier standards for hassle-free shipping.
LIGHTWEIGHT COST SAVING - Durable yet lightweight envelopes reduce postage costs without compromising protection.

BOX USA StayFlat Mailers are sturdy, self-sealing chipboard envelopes sized 12.75" x 15" designed to keep photos, documents, and artwork flat and secure during shipping. Sold in convenient 100-count packs, they combine professional-grade protection with lightweight design to save on postage while meeting USPS and commercial carrier requirements. Perfect for small businesses and creatives seeking reliable, reusable, and moisture-resistant packaging solutions.

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

€ 377.70

Duties & taxes incl.

Netherlandsstore

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Received my product in pristine condition. Great service overall.

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Manufacturer	Box USA
Brand	BOX USA
Item Weight	33.6 pounds
Product Dimensions	15 x 12.75 x 0.1 inches
Item model number	BURM4SS
Color	White
Closure	Self-Seal
Shape	Rectangular
Material Type	Cardstock
Number of Items	100
Size	12 3/4 x 15
Manufacturer Part Number	BURM4SS

BOX USA StayFlat Mailer, 12.75"L x 15"W, Pack of 100 | Stayflats Envelope Keeping Photo, Document, Artwork Protected During Mailing and Shipping, 12.75x15

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