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[jonumberone]

Originally Posted by markem

Good point Adam. I'm vac sealing but carbonation would be an issue.

Why not just pour the soda into a bowl, let it sit and go flat before putting it into the bag?
I don't know the science behind how long it takes to get a can of soda to lose all of it's carbonation, but with increased surface area, and maybe some periodic gentle stirring, I'd be willing to bet that the soda could go into the bag somewhere between 4-6hrs.
Just a guess on my part and I'm willing to bet if anybody knows how long it would need to go flat, it's Adam, so maybe he could chime in with his thoughts on trying that.

As for the your original question, If using a full can of soda is you'r tried and true method, I would go with that after you get the soda flat.