M.H.
Totally agree w/ Anna below. I have the Kolcraft tandem stroller as well and LOVE IT! She's right, the universal infant seat adapter has worked on my Graco as well and seems like it would work for any brand. It does fold down pretty nice and both seats can come off, which makes it even smaller. I had a Grand Prix when we bought ours and it fit, but was somewhat of a pain to squeeze in - but you're going to have that with any double stroller - they're all bigger than a single. I now have an Acadia, which makes it that much nicer :) My kids are 19 months apart and it works well. They're now 2 1/2 and 4 years old and we still use it from time to time if we have a lot of walking to do and my 4 year old doesn't want to walk the whole way. It's served us very well since my youngest was born. I would definitely recommend it! Good luck!