Our trail bags are meant to carry small things with you on your day trips. We use a very high quality canvas called Sunbrella Seamark. The canvas is waterproof.
 
The “Horse size Small Trail Bag” measures 6” x 4.5” and will hold several small items such as treats, hoof pick, a sandwich, etc… The large is approximately 7"x7".  The Combo Trail Bag is a large pouch on one side and a drink holder on the other.