We got these for our trip to Hawaii. They were actually very nice to have when going to the beach and going to the pool in the evenings.
My wife started using her bag for a daily bag just knocking around. The external zippered pocket is great for holding money, keys or any small items.
They aren't big enough for the fins we own for snorkeling but for a mask and snorkel along with a towel and sunscreen and even room for our underwater camera it was a decent way to go.
The cords aren't the best for being a bit burnt and having too much weight in them.