Punching Bag - Hot or Not?

Desire to Inspire had a great post on the creative interior design firm FLUXinteriors. One picture, which I assume is some type of man cave, featured a vintage punching bag and boxing gloves in the corner. Could punching bags be the new card catalog? Clever idea for any area in the home, and when you get mad from Blogger messing up your post (again)...give it a good whack. Bonus!
Unfortunately, vintage punching bags seem to be scarce on the Internet. Maybe they are one of those finds you magically see at a fleamarket. For a smaller alternative - boxing gloves on ebay (see seller transformwars) and vintage sporting goods at Howard's Visual Merchandise.