Ken put my new shelf up in the bathtub and i love it. It holds all of the things that I had crammed in the bathroom closet and it's sturdy. I had tried one of those smaller shelfs that stick to the wall using suction cups...yeah it fell down like every other day. Not nice when you're in the tub and a bottle of body wash falls on your foot.
And yes before you ask, that is a ratty bed on the bottom shelf. I have to hand wash this bed because it's almost 3 years old and has a couple of holes in it but it's holding up really well. A friend I met on FB made it for my boys and sent it to me all the way from Australia. The boys love it so I hand wash it so it doesn't fall apart.