Handlebar bags attach directly to your handlebars and are available for both drop and straight style bars. Used most often by bike tourers, these bags keep gear like gloves, maps, and snacks within easy reach. Rack trunks attach to the shelf of your rack. Sleek and roomy, they offer moderate storage capacity without much wind resistance. Hydration packs are worn like backpacks and hold water on your back so you can drink without taking your hands off the handlebars.
Some models offer limited storage capacity.
Courier bags have a kind of counter-culture couture cachet, but are practical for protecting and carrying paper documents on your way to work. Panniers are roomy, rack-mounted bags that keep heavy loads low and centred on your wheels. We're not going to try to teach you how to fix your bike over the web, but here are some tips and resources. If you're out riding in the mud and sand, your should clean and lube the drivetrain after every ride. Commuters can get away with less frequent cleaning, but surprisingly there's a lot of grunge on the road just waiting to hitch a ride on your chain.