-Always stacks neatly. I've stacked up to 8 ft high or 5 bins tall. -Uniformity makes it easier to find items, IF the boxes are clearly labeled. -Collect over time. Purchase 3-4 bins at a time. -The bins I purchase, featured in the photo above, work well for shelf stacking. No need to dismantle a stack for one basket on the bottom. -This flat top option is also a sturdy versatile alternative.