Jonathan, I spent a month backpacking in Switzerland and France with a girlfriend in uni from Geneva to Zurich, with lots of hiking and side trips in the Haut Jura, Bernese Oberland and Entlebuch. Every morning we bought supermarket baguette, yogurt, muesli, fruit, veg, sometimes trockenfleisch (jerky) for the day and enjoyed occasional splurges for good beer, inexpensive wine and the rare cafe lunch. We had a fairly slender Victorinox folder with about a 3 in. blade and corkscrew + two metal spoons. We always tore the baguette with our bare hands. We survived.
There’s a lot of overthinking here, but it’s fun.
I got the stainless No. 7 rounded My First Opinel on Ken T’s suggestion and it has an honored place in my lightweight but crazy well-equipped picnic set and sometimes backpacking. Sharp blade, works great for spreading and also decently well for scooping spreads out of a container. My grandfather was a butcher in a store and in younger years in wilderness, and I wouldn’t use the Opinel for butchering, but you don’t plan to use it for that.
Doug’s rounded No. 7 is hands-down the most beautiful one I’ve ever seen. Almost looks tailor-made for the Swiss City of Bern, which has a bear as its symbol (there’s a bear pit in the center of town where sadly bears were kept for many years and fed scraps from tourists, a tradition which was thankfully ended many years before I was there).
I’m a huge fan of the Victorinox Little Vicky Paring Knife, straight edge, 3 1/4 in. blade (there is a longer version as well). Very sharp, light and maintains an edge for a surprisingly long time.
You’ll do well with any of the knives mentioned + a light spoon + perhaps a small light peeler (yes you could use the knife but it will waste more of the veg/fruit).
My preference would either be for a simple folder like ones you see here or the Little Vicky.