Yes. I did it but I would suggest you make small cuts instead of just one large in case measurement is off.

Yes, I did! Be careful to cut it straight. You might have to turn your straw around at some point. The tightness goes after a while. I’m on my 3rd one. No one else sells a standard mouth straw for the hydroflask.

Of course! We built this to be multi-size compatible with standard mouth bottles.