CareMail Recycled Shipping Boxes, Extra Small, 8 x 8 x 4 Inches, Brown, 12 Pack (1143553) Sturdy, brown, single-wall kraft construction for safe shipment, great for moving, shipping, and storage 100% post-consumer recycled content: Exceeds the EPA's Comprehensive Procurement Guidelines (CPG) for products containing recycled materials Recyclable with mixed corrugate Holds up to 65 lbs.; Durable 32 lb. edge crush test rating Certified 200 lbs. per square inch minimum burst strength