https://www.amazon.com/dp/B0799FGHSK?ref=ppx_yo2_dt_b_product_details&th=1

This is what I use and the GBP 15.6 fits perfectly in it and has a couple nice pockets for accessories/charger.

I got a case, but its super thin. I also got a tpu keyboard protector thats super thin and keeps the keyboard free of just daily junk that gets in there.

The case i got is:

https://www.amazon.com/gp/product/B0799FGHSK/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

keyboard tpu cover:

https://www.amazon.com/gp/product/B08XXP83LQ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Keyboard cover fits perfect. Says its for all sorts of laptops but it works perfectly and fits exact for this model and year.