Bought for a Nursing hybrid re-licensing class to hold all of my medical take home kits. I bought XL size. Great size. Holds all my kits & my book& notebook. Folds down for flat storage. Made if very sturdy material & sturdy straps. Has pockets on ends & front, as well as one for your ID badge or other ID. Would also be great for pool or beach or travel. I carry it to class several times weekly to class and my materials are very heavy. It's very durable.