Seat post racks: carry extra gear
Whether it's while commuting to work, carrying shopping or doing other errands, many people transport stuff on the bike. Sure, using a backpack is convenient, but what about when you have to carry more, or it's a hot day, or you don't want to lug something on your back? Well, thankfully there are luggage racks available to carry panniers. Not all bikes come equipped with mounts on the frame for a conventional rear luggage rack. But have no fear; these racks, which mount to the seat post (and sometimes also at the axel), circumvent this problem, allowing you to carry panniers or other stuff on most bikes and making your bike infinitely more versatile.