Waterproof bags that fit securely on the bike are definitely an advantage. But if you’re planning a trip just to try it out, don’t invest in expensive bags. Maybe someone can lend you a set of bags for the luggage carrier? If not, fasten the bag securely to the luggage carrier. A backpack is not the optimal, as it hinders your freedom of movement and presses you down in the saddle.
Just like bikes, bicycle bags are available in all possible versions. The classic side bags are strapped to the side of either a rear or front luggage carrier. The rear bags usually hold 20-25 liters each, while the front ones are slightly smaller. In addition, there are handlebars bags which typically hold 2-12 liters. They are good for storing the things you want easy access to. Saddlebags that are fastened to the seat post can be an alternative to side bags on bicycles without luggage carriers.
You’ll also find a new type of bags on the market. They are fastened directly to the frame or front fork.