Ok, going to try to answer the questions posed...
They are not super squishy squeezy, but you don't need to give it too much of a squeeze to get it flowing. I think the lack of super squeezy is what makes it not retain odor or tastes.
I leave the twist thing on the top open at all times, I havent found a reason to close it. I guess maybe if it was in a workout bag and you were afraid it would get squeezed?
But w/the twist top in the open position it does not leak when completely upside down. To get the flow going you simply suck on it or give it a squeeze.
These do not have a straw, and the top is not as soft as a bite valve on a camelbak, but is still soft.
Almost a week in, and still loving this bottle. They are going to do imprinting, so I think we are going to get some done w/the shop logo.
Cool beans!!