https://brandtbox.com/product/4-3-8-x-4-3-8-x-2-1-2-white-corrugated-mailers/
Buy 4 3/8 x 4 3/8 x 2 1/2" 32 ECT White Corrugated Mailers (SKU: BSMLR5)
Brandt Box's 4-3/8" x 4-3/8" x 2-1/2" corrugated mailer is ideal for small fragile items. Order wholesale from us!