Hardware Recommendation

Anyone recommend a portable laptop or tablet for drawing and 3D modelling and sculpting?

A tablet that is portable and does not need a computer to work or a laptop that could act as a drawing tablet too.

I have a Wacom Cintiq 16 and Apple Mac but both are not portable.

I need something for when I'm off of University.

I read that iPads aren't compatible with ZBRush so it needs to be a device that can work with this software and prefrably Maya and Adobe too.

Ive looked at Macbooks as well but am uncertain is this is a good investment as I just need something to pick up my drawing and modelling when not at University.

I don't want anything expensive, preferably under £1000.00 but good specs also.

Basically if anyone has anything they can recommend for digital art, sculpting, modelling, rendering and animation but is portable.

I can't ask this on ZBRush site because the people that respond say they aren't experts and can't help with any questions about zBrush. But I will still use Adobe software as well so this post is relevant. 

Thanks so much