Storage unit is almost water tight.  I store my winter covers ( holds 4), in these. I purchased 2, after about 7 months of being outside, 1 deck box had 3 drops of water on a cover when I opened.  I checked after several rains, water actually drips in when you open the lid if it’s wet.  Good buy, nice end tables, which is how I use them, also sturdy enough for grandkids to sit on (ages 2-10).