entertainment for 4 monther that travels easy

juliekyle05

My DS goes to my MIL, stepmom and my mom's during the week so I'm looking for some entertainment that packs up and is easy to take along.  I bring his playmat and have packed the jumperoo a few time, but it's heavy.  Anything you can suggest?  I bring little toys too, but I'm looking for an activity center or something.