I would like to introduce my products to the members of Woodworkers Post. They're called the Kerry-All Pouch and can be seen on my website (http://www.kerrywoodworking.com).
They are made of woven polyethylene and are designed to carry a few sheets of plywood or drywall (the 4' x 8' size), baseboard trim and moulding (the 3' x 17' size can carry 16' moulding) and one made to cover a 34 sheet lift of 1/2" drywall (8' and 12' lengths).
They can keep various woodworking products dry on a flatbed or other open-style truck (i.e., pickup truck).

These pouches are re-usable and a great asset to a “green” building company. So many companies use rolls of single-use plastic every year and this is terrible for our environment. We can also make any custom size needed, including covers for full lifts of lumber. In fact, I've sold a few to a small company that delivers mattresses.

Feel free to ask any questions, or make any comments. Constructive criticism is always welcome!