I like to add basically a chai spice mix. I’m a snob when it comes to chai, so I’ll mortar/pestle up spices to use for chai, and I’ll often do enough at once for multiple batches (even though it’s best completely fresh). It goes really well in oats. If you want the lazier version, “pumpkin spice” mix in the US is basically a chai spice mix.
For savory oats, I treat it like congee. There’s a lot of ways to make it, but you can either take it in a western direction (chicken stock, bacon, fried eggs, etc) or more Asian (dashi/miso stock, soy sauce, sesame, ramen egg, etc.).
That tannery is a subsidiary of red wing boots, so I bet it’s really high quality. I’ve had stuff made from leather that looks like/sounds like that. I think it’s just completely full-grain that hasn’t been pre-“broken in”, so it feels really stiff compared to a lot of cheaper products that beat it up ahead of time so it looks right out of the box. It’s should take on a really nice patina.
Good news on the waterbottle pockets, though. Too many companies put them on bags assuming we are all still carrying around tiny bottles