What to say if package is delivered?

My horny ass bought a 120cm doll but it came later than expected and now my father will be probably at home while it is delivered.

So now my question is what can I say I ordered without him getting suspicious? I thought may be school books but I don't know if the package is too big for it to be believable?

Edit: Alright, thank you for your responses. Luckily he was asleep and so I stored it in the basement without him noticing anything.