You fold the 4 sides together until it's one flat panel. Step on the bottom & fold in half toward you until it bends. Place top right corner on top of bottom left corner (or top left corner to bottom right, w/e) after that it should become easier to fold & smoosh together into the bag. Hope that helped a little.
The official Playhut website provides a list of shops where their products can be obtained. The list includes Amazon, ToysRUs, Walmart, JCPenney, Kmart, Target, QVC, Big Lots, Diapers and Yoyo.
Several companies make Thomas the Train toys like Fisher Price, Playhut, or Jay Franco & Sons Inc. There are many more companies and Toys R Us sells most of them.