Perfect Size Mailers These bubble mailers (6x9 inner size&6x10 outer size) perfectly fit small to medium items like jewelry, phone cases, or trading cards. The dual-size design works as both shipping envelopes bubble mailer and padded mailing envelopes for eBay/Etsy sellers. High-Grade Protection in 3 Layers 140gsm tear-resistant outer layer + 140gsm bubble wrap envelopes lining + reinforced self-seal flap. Your fragile items stay safe in these padded envelopes 6x9 during rough transit no more damaged returns! Stealth Shipping & Tamper-Proof Design Full black non see through bubble mailers hide contents completely. The tamper-evident adhesive on these mailing envelopes bubble padded shows obvious marks if opened ideal for high-value or private items. Ships Faster, Saves 35% Postage These lightweight bubble mailers 6x10 beat bulky boxes! USPS First Class certified.