These do not look like they're fun to drink straight from the flask,
but gotta say their finish looks way more durable than the SIGG's (they scratch rather easily).
The wide mouth is just like drinking out of a cup. Prefer it to the keepcup. Had a few for years now and the finish is pretty resilient. The translucent ones seem to last a bit better than the matt finish.
Klean Kanteen wide mouth insulated and I agree with screw top suggestion.
https://www.kleankanteen.co.uk/collections/insulated-bottles/products/insulated-coffee-mug-12oz?variant=31356475666
nice colour.. https://www.urbanindustry.co.uk/products/klean-kanteen-wide-insulated-12oz-flask-fresh-pine
I have the smallest which is perfect for one and it fits in a bottle cage too...
https://www.woolerwheel.co.uk/winter-cycling-food-and-drink/