There are several kinds of golf bags that can be used for carrying your clubs. Some of these include Pencil, Carry and Trolley. Whichever you choose, they need to be functional and useful to you while you are golfing. Your personal preference will weigh heavily on which type you choose. Each type has their own advantage over the others.
The Trolley style is on wheels and it will be pushed or pulled around the course to the different areas. You can put a full set of clubs as well as anything extra that you might need to carry with you while you are on your rounds.
Carry style bags are intended for carrying on the back. These too offer space for a full set of clubs as well as space for any items that you may wish to carry with you on the range. Many of this type of case today is used as a storage case for clubs during the off season because they tend to be quite heavy and difficult to carry.
The Pencil style is a smaller, more compact golf bag that is intended to carry only a half set of clubs. It is carried in a backpack like sling and is very convenient for short games such as nine holes.
When you are shopping for a product of this type you need to keep in mind that while the bags itself may be lightweight, when you add your clubs and any supplies you might need to carry with you, it may become too heavy.
For those with back problems it is a good idea to consider using the Trolley style as the only time it will need to be lifted will be taking it out of your vehicle and putting it back in. The Carry style will likely be too much weight for anyone with an injured back. The Pencil style is handy in the event that you don't want to drag out a full set for a quick round.