I agree with Keef on this one, it all depends on what you're used to. I use an A5 AFE kneeboard which opens out to A4 size, on the front I keep my flight log it has a clip to keep it steady while I scribble things down when I'm not using that (ie coming into land or just want to look at the layout of the airfield I'm coming to) I open it up and inside I've got a few plastic wallets that keep my checklist and flightguides in as well as spare flight logs.
Pilot 16
It wouldn't be inconvenient for you to open the kneeboard out when you need the information inside, that's why they're made like that to save space.
I have my kneeboard open while consulting my checklist prior to taxiing and take-off, then close it again until I'm up in the air and need my map.