My stash is funny, as it's not really hidden.
Sure I keep my clothes, bottles and pacifiers in the drawrs as leaving it around I'd just end up losing them (Especially with all my unwashed clothes just laying about)
I have Doctor Who bed sheets which will soon turn into Pokemon or Ben 10. Ben 10 bathrobe hanging on the back of my door, toys everywhere, plushies at the foot of my bed, and then whenever I have diapers, the diaper bag is right in the middle of my room next to the drawrs.
I live with my Grandparents (Who are currently away in Finland) and Uncle. I don't care much if they find out, I walk around in my sleeper anyways. My Mum on the other hand, is who I need to be careful of, she doesn't like it and I hate lectures, so I hide some of it when she comes down - which is why I haven't bought diapers recently.