I was just wondering if I could use a smaller bag instead of a typical gallon Ziploc bag used by most people. I wasn’t really sure if the size of the bag would matter.Well, precision is not really a realistic goal itself as you're not going to get all of the air out of the bag before filling, and you're going to suck some ambient air in when you fill. Your real goal is to protect yourself with ballpark readings. I don't bother with calibration every year as the unit software will adjust enough to keep me safe. I do test my current unit and a four year old unit both to see if they actually react to CO when I remote start my car in a closed garage, but that's risky so be sure that you have an easy exit if needed.
The reusable Stasher bag looks like a nice tool. It's a matter of choice I guess. If you get a yellow bag and can read the unit thru it ok, it'll be easier to keep up
I got a clear bag so I can easily read the unit thru it.