BOX USA Shipping Boxes Small 12"L x 4"W x 2"H, 50-Pack | Corrugated Cardboard Box Mailer for Packing, Moving and Storage 1242: Amazon.com: Industrial & Scientific
12" x 12" x 4" Corrugated Literature Mailer
18x12x4.5 White Bin Boxes | MrBoxOnline
Amazon.com: Boxes Fast BFML14112 Corrugated Cardboard Literature Mailers, 14 1/4 x 11 1/4 x 2 Inches, Tuck Top One-Piece, Die-Cut Shipping Boxes, Large White Mailing Boxes (Pack of 50) : Office Products
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12x12x4 in, White, Literature Mailer - 55VK78|55VK78 - Grainger