50 Piece Variety Pack * Bubble Mailers * 5 Sizes These popular padded envelopes are sturdily built with bubble lined wall construction for extra protection during transit. These tough premium shippers are proven solutions for a wide variety of items. Self Sealing Bubble Mailers provide outstanding low cost shipping protection for a wide variety of products. Shipping labels adhere securely to the recycled Kraft paper cover so the incidence of lost packages is reduced.