We bought this for an extensive itinerary for our summer vacation- 6 flights in one month. We were able to fit one backless booster and one regular "backed" booster seat in here with no problems. There was plenty of room for more items- including 4 pairs of shoes that were removed from an overweight luggage bag. It held up very well and is still looking new- no holes or snags. It is big and bulky when filled, but the shoulder stap makes it easy to throw over one shoulder and carry it through the airport. This was definately worth the extra cost.