I think the Joovy is basically just an upgraded Sit N Stand, so it is just as bulky, sadly. It's a good idea, just too big from what I have seen.
How much does the 3 year old walk? Would he stand on a stroller board? http://www.babyproofingplus.com/item2826.htm would probably be lighter. You could also look into a stroller like an Inglesina Zippy or a Peg that has a built-in footboard for a kid who just needs to catch a quick ride.
How much does the 3 year old walk? Would he stand on a stroller board? http://www.babyproofingplus.com/item2826.htm would probably be lighter. You could also look into a stroller like an Inglesina Zippy or a Peg that has a built-in footboard for a kid who just needs to catch a quick ride.