Your search for "stretched burlap" revealed the following:
White Canvas Pillow Cover with Zipper - Square (available in 4 sizes)
$10.99Create your own pillows with blank white canvas pillow covers. Available in a wide range of sizes, they are perfect...
Canvas Bag - Canvas Shoulder Bag (available in 3 sizes)
$4.99Show off your personal style with Canvas Corp's shoulder bag. Also used as a cross-body, this 100% cotton craftable surface...