Poly Shipping Envelopes 9 x 12 sold in wholesale packs of 500 Mailers that are an easy packaging solution for non-fragile items like T-shirts boxed jewelry or collectibles Space-saving flat shipping mailers for those with limited space within there warehousing storage Small businesses save on extra packing materials with all in one packaging and shipping solution Save on transportation costs with cheap poly-mailers that are an easy pack seal and ship option Flexible packaging that is resistant to splitting moisture and being tampered with