Thickness: 2.5 Mil.Color: White — conceals packages from visibility.Made from premium polyethylene—which enables easy label, stamp and ink application.Plain exterior—ideal for logo/brand printing and marketing.High adhesive seal strip—packages are tightly secured.Provides excellent protection during shipments.Puncture resistant and tamper/water proof.Approved by UPS, FedEx, and USPS.Ideal for non-fragile medium size shipments.Economical shipping method—substantially less expensive than using corrugated boxes and mailing tubes.Interior color of mailer is subject to change.