Our white top cardboard mailer boxes are perfect for any subscription business, as literature mailers, presentation box, luxury packaging, sales kit or great for any gift idea. Premium 35 BF SBS white from ITC/Iggesund ensures aesthetics while ensuring superior performance. Our white flat mailer boxes are made from 100% secondary fibers and are chlorine and acidfree. Sustainably sourced & recyclable. Buy white mailer boxes wholesale from Upack. Design online: add your logo and let your brand stand out! Measurements shown are outside dimensions.