Hard bags are available in all the major type designs listed above, and will often be hard plastic or, in cases when more durability is needed, metal such as aluminum. Hard bags are also more likely to be weather-proofed and lockable. However, many will be bolted down to the bike so will be difficult to remove for easy transport. In those cases, additional mounting hardware may be necessary unless your motorcycle comes equipped with racks for luggage already installed. Hard motorcycle travel bags also tend to be a bit more bike specific to ensure proper clearances and fitment, though universal options are available.