The 30 quart Ultra Latch boxes have helped me to accomplish more every day since I tried an order of 6. The size is just right for most storage items and not too heavy for me to lift when full. I can carry one on my lap and still see where I'm going (a real plus when using a wheelchair). The see-through bottom helps me identify the contents at a distance, although for some I also add a label or date. The latch top helps avoid spills and keeps the box secure on shelf or floor and even keeps curious critters from getting in trouble. I use some of the 66 quart size for larger bulky things but the 30 quart is one way I do more in a day and don't have to ask for help!