Pack of 500 Mailing Bags Inside dimensions: 12 x15.5 Outside Dimensions: 12 x17 Shippers made of a polyethylene material that is resistant to light and is not see-though Peel-N-Seal adhesive lip to seal each mailer once packed that can only be opened with a cutting utensil Mailer with a printable surface that can be personalized with vendors and carriers logos or brands Protective cheap poly mailers perfect for transporting items and merchandise considering they re waterproof