I broke mine down flat, and stashed it in the back of the garage. I decided to do this after someone on the car seat forum I frequent had to send hers back to Britax for a problem she was having, and was having a difficult time finding a box to ship it in. The box really doesn't take up any room and we have an out of the way place to put it so I figured why not keep it. But normally, we recycle that kind of stuff right away. Of course, hopefully, I won't even need it but in this instance I'd rather just keep it on hand just in case, since the seat is so big. If I did have to ship it somewhere, I wouldn't want to have to try and find the right size box for it and have the extra expense of buying one too.