I love my Garmin Instinct 2, but it is probably larger than you'd like. They have the 2S, which is smaller, but you would probably be better served by the Garmin Forerunner 45, which is lighter than both Instinct models.
For an even lighter watch that I've seen recommended, but haven't used myself, you can look at a Coros Pace 3 or similar. It is a smidge lighter than the Garmin Forerunner 45.
Both brands have great GPS features and the ability to do stopwatches and quite a few other functions, including some smartwatch capabilities.
I have a Goruck GR1 that has been going strong for over a decade. It's been in multiple countries, often in harsh conditions. It's been dropped in an ocean. It's been tear gassed a time or two. It's been through a lot, and still looks almost new.
I've purchased a few other bags from them (the most recent being an M23 delivered this very week).
Lifetime warranty. Great construction. I have no complaints.