I agree with topher, if you have a sandbag use it! They are f***ing evil! You can make them, there may be directions on rossboxing.com or bodybuilding.com.
Myself and a couple of training partners train with sandbags, kettlebells, sledgehammers, body weight squats, push ups, burpees, deck squats, etc...it's kind of a caveman workout, very low-tech. But, I have to say it's by far the most effective strength and conditioning workout I have ever done, and I've tried a lot of routines. It has induced vomiting and dry heaves in a number of people, not for the squeamish.
If you're interested, some of our workouts are posted at the following site:
www.myspace.com/enterthedungeon