Using the Eagle Creek Pack - it Reveal Sack is a breeze. First, decide what you want to store in it. It could be your toiletries for a weekend trip, or maybe your electronics cords for a business journey. Just open the #5 self - repairing zipper and place your items inside. If you want to attach it to your duffel or backpack, use the triangle snap - hook. When it comes to visibility, the breathable mesh allows you to quickly spot what you need without rummaging through your bag. As for maintenance, since it's water - resistant, it can handle a little splash. But remember, it's best to hand - wash it only. Avoid using harsh detergents as they might damage the recycled fabrics. Keep it in a dry place when not in use to maintain its quality. And don't worry too much about the volume. The 8L capacity is calculated from the dimensions, but small variations might occur due to the sewing process.