I am in the process of putting this container together (without assistanced, might I add).  Once this task is compleged, I do believe that my eight large, high-back chair cushions will fit nicely for storage.  I needed this container to store some of my outside chair cushions because my garage looks like a "hoarders" bin.  I plan to store two, large chaise lounge cushions as well.  I have acquired two other storage boxes (which should accommodate all of the other outdoor cushions that I have).  I know that everything will stay dry, because the smaller, companion storage bench did well in last night's storm.