I remember a hiding spot I had about maybe, a year ago. For you gamers, you will see how this would work. I keep all my boxes for stuff I buy, in case I need to return it. When my first xbox 360 broke, I sold it on ebay, I bought another one (after slaving an entire summer working to save the money). Either way, I kept the boxes for both. They are under my desk. I used to keep diapers in my attic before that, but it was really noisy at night to go up there. Then I found the idea, and a bag of depends fit perfect in the xbox 360 box. No one would ever open it, they would have no reason to. Why would anyone but myself open up an empty xbox 360 box? It worked great for me when I had them. Plus, I had two boxes, so I lucked out. Easy access to diapers, out of sight and inconspicous under my desk on the shelf, but easy to get.
If any of you have boxes, I would recommend this idea, or if you can get your hands on an xbox 360 box, that would work perfect.
I don't know where you would find one though.
I'm pretty sure a PS3 box would work too. My friend has one and it's about the same exact size.
Hope I helped.