This backpack has an insulated structure with both cooling and warming functions. How about it for a little shopping or outdoor activities in the coming season? I bought this new on this site and used it several times for grocery shopping. It's made of thick, cushioned material. The zippered top section is the perfect size for an egg carton. It's also cushioned, so you don't have to worry about it crushing other groceries, which was very convenient. The main compartment has a capacity of 8L. There are two aluminum-lined pockets on the outside, one on each side, that can hold drinks or a folding umbrella. I kept extra shopping bags in them. There's a deep zippered pocket on the front that easily fits a long wallet. Also, there's a space on the back to put a cold pack, so it seems to be designed to keep your back cool even in the summer. I will fold it up small for shipping. Thank you. Navy