Boxes have been a shipping staple for years, but what if you don't need all of that space? If you are shipping smaller items, consider using Elementree Expandable Mailers. These kraft mailers feature a 2.5" gusset making it ideal for clothing, documents and other soft goods. With a sturdy kraft paper construction, and water-resistant barrier your shipment will arrive safely to its destination. Ship Wisely with Elementree. Seam Type: Side; Flap Type: Square; Security Tinted: No; Opening: Open End.