Thinkpad P52: How unportable is it?

I'll make this quick, I own a T470 that's been struggling with AutoCAD at uni and a opportunity to sell the desktop I have back at home popped up, so I'm thinking about selling the desktop and buy a P52 on a local refurb store (can't risk getting taxed on Ebay). How unbearable is it to carry on a backpack?

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Edit: BTW, how does the quadro T2000 compare against a desktop 1650?