【Bubble Mailers Size】 Exterior Size: 8.5 x 12 inch. Usable size: 8.5 x 11 inch. our mailer envelopes are lined with unique air cellular layers and 360strong air bubble technology, which can help absorb shock during shipment and provide effective shipping protection for your products..【Self Sealed Envelopes】 Our bubble mailers come with a self-adhesive tamperproof seal. Once the envelope has been sealed, it cannot be opened without visible signs of tampering..【Sturdy & Durable Construction】 The thicken shipping bags covers with polyethylene material, making them not easily punctured and damaged. Beside, the shipping bags features with excellent waterproof and tearing proof effects because of the reinforce sealing on the edge. They can keep your value stuff safely to destination even though using on rainy days..【Convenient & Easy to Use】 Our poly shipping bags are the perfect choice for small and middle business for easily using with not require extra packaging material, which can improve your company productivity at work, save much time and mailing cost. It is very suitable to transport for jewelry, business cards, medicines, cosmetics, pins, accessories, makeup supplies and more..【100% Satisfactory Service】 We responsible for every bubble mailers that we sold, If you have any problems with our products, please don't hesitate to contact us.Our service team will respond quickly to your problems within 24 hours.