Many Lake Erie charter captains use the Amish Outfitters Buggy Bag trolling Sea Anchors and Drift Bags. They are known for their durability. The Amish Outfitters Sea Anchors bags come in four sizes. All sizes are measured in open diameter. The size of the bag needed is dependent largely upon the size of the boat, the speed of the boat, and how slow you want your boat to go. The following measurements are just a guideline. Size of Sea Anchor ** Length of Boat 15" Sea Anchor ** 16' - 19' boat 18" Sea Anchor ** 16' - 19' boat 22" Sea Anchor ** 14' - 24'boat 28" Sea Anchor ** 24' - 30' boat 36" Sea Anchor ** 28' - 32' boat 48" Sea Anchor ** Greater than 32' boat For most trolling you can almost always run one bag. The exceptions are when trolling in a big following sea, when salmon fishing in water that is only 34 to 38 degrees, or Fall fishing for walleyes in 40 degree water. For smaller boats you can get the same results from running two smaller 15-18" bags, one on each side, instead of running one larger bag. This will make steering much easier. The Drift Bags are designed for Drift Fishing only and not for trolling. Amish Outfitters Buggy Bag Sea Anchors $32.95 Amish Outfitters Buggy Bag Sea Anchors (Pair) $59.95 Amish Outfitters BEEFY BAG Sea Anchor $55.95 Drift Bags $49.95