I stuffed everything that my 2 year old son and I need for the beach, including both of our bathing suits and cover ups, two full sized beach towels, two changes of clothes for him, a 72ct pack of wipes, about 20 diapers (for the entire weekend), a bag of Kleenex, two small bottles of Shampoo and Lotion, and our swim shoes. I still have a bit of space, but don't want to over stuff it. I bought this bag for a trip to Atlanta, but I'll be using it for the beach first, and will update my review if it doesn't hold up for either of these trips!UPDATE: I use this backpack for every pool and beach trip and stuff it to the brim every time! Glad I was able to get it when it was only 12 bucks because it's the best $12 bucks I've spent! I used it as my "under the seat" carry-on when I took a flight, and with my laptop, and everything else I had in it, it was a little hard to get it down between my legs and under the seat, but I didn't have a problem with airline staff in reference to it's size. I just left it under my legs.