If you're looking for a clever multi-purpose bit of baby kit for when you're out and about or staying away from home then this is it. The Munchkin Travel Booster Seat is a Changing Bag and Booster Seat combined, and is down to £12 at Amazon, including FREE delivery.
It's a great seat to use when toddlers are getting that little bit too big for high chairs, but not big enough for adult seats, and the adjustable height positions mean it can be used for a longer time that a fixed one. It has a safety harness to keep little ones put, and the firm moulded bag protects the contents as well.
This is a great buy, and a very clever design that solves a tricky issue for parents of toddlers when out and about. Certainly a handy piece of kit and something that you can keep at Granny's house if need be. We use something similar and if we go to a small cafe with limited space.
You could even get one if your own home is short on floor space. These are a lot cheaper than a standard highchair.