The Canmore Zippered Pipe bag is made of a Gore-Tex material that has a pinhole-free fabric and fully sealed stitching. This bag is requires virtually no maintenance (no seasoning, naturally supple, pick up and play at any time). The fabric has automatic moisture control. The Canmore pipe bag is basically a no tying-in bag where you only need to tie in chanter stock. All other stocks are a friction fit. The Canmore zipper bag is available in Small Extended, Medium, Medium Extended and Large. If you are looking at a new pipe bag and would like to have either internal moisture systems, or drone systems, then this is a great pipe bag for you.