Mailer Box Mockup for Ecommerce Packaging and Unboxing. Mailer Box Mockup for Ecommerce Packaging and Unboxing lets you wrap a full printed design around a realistic 3D mailer box. The box colour is customisable and the artwork applies across the mailer surface as a single print area. Use this mockup for packaging pitches, subscription box branding, ecommerce launch campaigns, unboxing content, and client presentations. Especially useful for DTC brands, packaging designers, subscription services, print shops, and marketing agencies.