10″x13″ IS THE ACTUAL USABLE SIZE 3MIL for Super Extra Strength! White exterior with Grey interior for privacy! Great for shipping a very wide range of non-fragile items like Clothing, Shoe box, Gifts, etc. Premium Quality: These envelopes have a good stretch, lightweight, puncture & water-resistant! Tear Resistant: The adhesive on the fold-over flap is like permanent glue and so tamper-evident! Simply pack, peel and seal! Lower shipping cost for your business! Approved by USPS, FedEx, UPS, DHL, etc. 100% recyclable! ***Need large quantity or have questions? Please message us! Thanks