... in optionsPerfect apperance for mailing items, colour in options - grey, white, black, red, pink, purple, metallic blue, neon green, ... China. We can produce poly courier bags with outside white and inside black or grey, poly courier bags with serial numbers ... need protections. Unlike other Shipping Supplies, Poly Mailing Envelopes do not contain any bubble, foam or paper cushioning. Therefore, the ...