KRAFT BUBBLE MAILER, SIZE # 4, 100 PIECES BL4 Mailers are self-sealing for easy packing with a tamper-evident Completely opaque for content privacy and professional appearance These mailers are 100% recyclable. Use for all of your shipments with all carriers including UPS, FedEx, DHL, USPS and more Air bubble cushioning along with the rigid kraft paper exterior provide exceptionally light protection