Sunshine Kids Side-Rider

This is the only thing I've found that will even fit onto a Britax. Packaging does not include any instructions - but it does attach to the side of the seat itself (someone had mentioned being able to attach theirs to the fabric seam, but I was unsuccessful with that method.) We love it - grateful there's something out there that will work!

This flexible bag is easy to clip on to car or booster seats. It's very durable (one of mine has lasted four years+ with lots of abuse)! My two children ages four and six use it to hold drink cups, crayons, and those assorted small items that kids love to hold in the car, but can never keep up with. We can't do without it. I highly recommend its convenience and durability.

I needed a cup holder for a car seat & this is just what I needed. It is a bit bigger than I needed, which mmakes it a little hard to fit on the seat, but it's still do-able. It's also kinda nice that my daughter can fit more than just her sippy cup in there.