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.