I believe Hammer and Ebonite are the same bags. If you are looking at a 4 ball inline bag, check out the KR or Brunswick models. They have an extra end stand on the pouch to keep the bag from tipping over.
If you dont need a lot of room, they make a 3-4 bag. This does not have as many pockets for storage, and does not come with a joey. If you need the extra room, the 3-4-5 bag by KR (also have a BRUNS model) work great.
If you are not interested in a 5th ball, they also make a 2-3-4. Same concept, 2 ball bag, extra pouch, and a joey.