Easy to put together. I didn’t need a heavy duty box. These are just fine for short term needs for relatively light items. Although I used them for books, too.
If you're a fan of old-school banker boxes, these are not they! The cardboard is extremely thin and fragile. I have 30-year-old banker boxes that are still holding up just fine, packed several high with files. I don't expect these to hold up 30 weeks. :(