We will be leaving on our fourth trip with GoAhead - they have the best Tour Directors by the way!. We have received different size of travel bags on each trip I think. They are carry on size. I usually buy or make a distinctive name tag so I can sort mine out from the others. I use it as a carryon on the trip to our destination and as a day bag on tour,often leaving it on the bus. I take out the water, and whatever else I think I will need, and put it in or on my purse. I find it useful to bring home "loot" (souveniers) I buy on the trip. Large or fragile items I usually ship. The bags are usually a durable, if lightweight, canvas type material. After using as a carry on on the way home, they are useful for weekends away, etc.