I'm trying to find a cake storage container that's airtight, but designed like a cake dome, so with a flat base and a dome that sits into an airtight seal on top of it. Not necessarily dome-shaped iykwim. I can see lots online, but while they give outer dimensions, they never give inner dimensions, so I don't know for sure if my 2-tier 10" diameter cakes would fit inside. Has anyone got one for the same size cake? Or know where I might get something decent?