Small Trifold measures 16.5" long (6" closed)x 8.5" high and has 3 compartments. 1st has a single clear pocket 7.5" x 4".  In between each compartment are NON-removable document loops.  Center is where the clipboard is.  Clear pocket is 6" x 4".  Clipboard pocket is 8" x 4.5".  The third compartment has 2 pockets.  One takes up the hole side and is 7.5" x 4.5".  the other pocket is on top of that one and has a clear plastic top.  It measures 3.5" x 5".
Outside has your attached adjustable legstrap with plastic buckle.
All our Kneeboards are made of Cordura fabric.  A frabric that is water and mold resistant, fire resistant and extra durable.  We double stitch all the edges, for added durability.  The Plastic is also a higher quality to withstand tears and gashes.