What is everyone using for a water bottle/container in transit? I searched the forum for this and surprisingly didn't find anything.

When I'm land-based, I'm usually carrying around an Ozark Trail (Yeti knock-off) tumbler. It's great for keeping my water cold, BUT is too bulky for travel. I've seen people carrying around pouch & collapsible containers, but not sure what's worth buying & what isn't. I'm also open to other container ideas.
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Update- After doing some more searching I did find one thread, although it hasn't been updated in 3.5 years. I'd still be interested to see what people are using now.

Mods, feel free to add this to the other thread if desired.