I don't use any shaker bottles, so I'll just give some thoughts on the bottles and won't vote. I'd think smaller (for one meal) is better and less parts are better as well (minimize total surface area to clean). The mous looks better and I think that is also important (you eat with your eyes first).
Since I spend an inordinate amount of time and money thinking and buying stuff to optimize my daily queal routine, here are my thoughts on that:
What I'd like is an insulated bottle with a wide opening. These double walled vacuum insulated stainless steel cups, but there are enough of these things for coffee etc. These things really work to keep water and stuff cool or warm. Something that is design to be filled but not shake queal.
I currently work from home so I don't take queal with me (yet), so I make a large mug with a Immersion blender for the day and put it in the fridge. I used to do this in a 2.5l mixer but you had to refill and end up cleaning two vessels each day, and cleaning a mixer is annoying. Cleaning an immersion blender and a mug is much easier and faster. Try finding large mugs with ~3L size! Or immersion blenders that are long enough... so my feedback would be:
Sell a mug that allows you to make your daily queal. It's important that the mug has a straight top surface so you can fill it water and let it soak for a bit to clean it. Sell an immersion blender that is just a quirl like a paint mixer or milk frother (not dangerous cutter-mixer) so it can be just a long axle shaft without a housing for a cage around the cutter knifes (my immersion mixer gets queal powder stuck to the shaft housing which is messy).
That together with a stainless steel vacuum wall bottle would be the perfect food prep set imho. But these things are somewhat hard to find.
