Buy something as close to 1 KG as possible, 14 inch display and a battery life that will last 10 hours.  A good candidate is Macbook Air or Surfice Pro.

Can't recommend on Gaming PC but if it's for “gaming” slap a Ryzen processor, a modern GPU, 32gb ram. And big SSD storage.  ( if using work, use cloud storage of install a RAID setup )