Using your Basil Navigator Storm MIK Side Bicycle Bag is easy. First, if you have a compatible carrier with three mounting points, use the included MIK Studs set to attach the bag. If not, you can use the separately available MIK Frame adapter. Once attached, you can use the adjustable elastic cord to store your bike helmet. To close the bag, use the roll - top closure, which has three attachment options. When packing, make the most of the 25 - 31 liters of storage space. Remember, this bag is waterproof (IPX3), so it can handle some splashes and light rain. However, don't submerge it in water for a long time. For maintenance, simply wipe the bag with a damp cloth when it gets dirty. Keep it in a dry place when not in use. The reflective logos on three sides keep you visible in the dark, so enjoy your rides worry - free.