New! White Package Delivery Boxes 9x3x3 Mailer Lot Of Approximately 55 Boxes -For tumblers 16 oz to 18 oz NOTE: ONLY for thinner tumblers****Not for thick walled tumblers. -Can also be used for shipping small, light-weight fragile items. -Crush resistant mailer folds to provide double walls of protection on front and sides. -These one piece mailers fold together in seconds.