These 18 x 4 x 4 White Cardboard Mailers (listed with inside dimensions) are strong and lightweight so your shipping cost stay as low as possible. These 18 x 4 x 4 White Corrugated Mailers feature crush resistant double walls, a wave-rule edge that cuts down on paper cuts, and fold together quickly without the need for glue, staples or tape. white corrugated mailerss are manufactured from 200 lbs./ECT-32-B oyster white corrugated material that can be stored flat, just the way we ship them to you, 50 per case.

18 x 4 x 4 White Corrugated Mailer Specifications

• Depth: 4 inches (inside dimensions)
• Crush resistant double wall protection
• Folds together quickly into one piece
• No sealing required