This might seem obvious, but it’s important to be comfortable when you are observing.
I use a simple Deck Chair that reclines. I can lean back and watch for meteors and satellites, or I can sit up at my laptop to control imaging sessions, or just take a break.
My chair also has a drink holder that can be used as a convenient place to keep my torch.
Its important to plan out your observing site so you can easily get to all your gear and navigate around in the dark. Think about where you will set up your scopes and other equipment, but don’t forget you!