These are top quality bags and they are built to last, with reinforced stitching, heavy-duty nylon straps, and heavy-duty zippers. These bags will fit on any type of bike with the help of many straps with Q-release provided. Made of synthetic leather. These bags won't crack like leather and they are low maintenance compared to natural leather. Unlike leather bags these bags are made of waterproof material will not blister in rain. Approx measurements are; Big Bag: Width 14 inches + 2 inches pockets on each side X Height 16 inches. Small Bag: Width 13 inches X Height 5 inches.