The Lowepro slingshot 200 was not made to hold a tripod for a good reason: unless your tripod is very compact and light it will get in the way of rotating the bag to the front so that you can access your gear without taking the bag off. You can sew on some camping straps and/or strong velcro, and give it a try: I successfully used such and arraingement on a larger waist pack to carry around a Consumer digicam and lightweight tripod (Cullman Magic II). However, I think a tripod sturdy enough for a dSLR and decent lens will probably interfere with the Slingshot.
I have a slingshot, but do not consider it adequate for "only" camera bag; its great for a go light situation, not for carrying everthing you own.
Mike K