This is just what I needed!  It's large enough to hold my six big chair pads and more.  It's pretty water tight.  Maybe one drip or two somehow made it's way in.  It's probably just moisture/condensation.  Perhaps when winter really takes hold, I'll cut a giant plastic bag and put it around the cushions.  It was easy enough to put together, although took a couple hours, alone.  It was a nice sunny day and I had the time, so it was all good.  The directions were pretty easy to follow.   Definitely fit the bill for me.