Amazon.com: BOXES FAST 18 x 18 x 28 Corrugated Cardboard Boxes, Medium 18"L x 18"W x 28"H, Pack of 10 | Shipping, Packaging, Moving, Storage Box for Home or Business, Strong Wholesale
Large Moving Box: 18" x 18" x 24" Box for Moving | U-Haul
Large Heavy-Duty Double Wall Moving Box - 18” x 18” x 24” (L x W x H) | U-Haul