Heavy Duty Zipper : The zipper is the most important feature on a bag, we have made sure that this zipper is very strong and durable to help avoid problems down the line. Waterproof lining: A waterproof lining keeps the water and grime from ruining the rest of the bag, and two drain ports help the bag breathe and dry out. Nylon Carrying Strap: Wide strap for easy carrying and weight distribution. Waterproof Lining: A coated nylon on the inside of the bag helps keep the melting snow and grime inside the bag instead of dirtying up the car or your nice clean ski jacket. This also helps keep the smell of stinky boots inside the bag. Just remember that you need to air out the boots at the end of the day, Double Stitching: This bag has double stitching at the critical seams of the bag along the zipper and to attach the bottom of the bag. This ensures the bag wont tear apart under normal use 600D Fabric: This heavy duty nylon resists wear and tear, and reduces the risk that sharp edges will cut through the fabric. It is also water resistant, to keep gear dry when inside.