Okay, well I have banged one of those around, and if I have a choice I am definately separating them. I really think you might want to consider a heavier free floating bag that has proper action.

This goes for the other items too. You want the ability to move around them. An item like that, nice as it looks coming in one piece, and I am guessing practical for a lot of people, is not IMO ideal to someone where space is not an issue.

As you stated tho, you are doing this mainly for the exercise and also I suppose that needs to be factored in.