I love my Patemm Pad changing pad. It folds up, so I carried it in my diaper bag when my son was a baby. It's huge and covers the entire surface of a public restroom changing table. It also works great on the floor or bed at home. I never needed the pockets, so I got the pocketless one. It folds up flatter and fits well in medium or large diaper bags.
My son was also a huge drooler, so that pad was also great for protecting the floor -- at home or at playgroups.