You all have a lot more faith in my ability to get rid of things than I do: reebert guessed a whopping 12 bags! ms_hackman guessed 24 but I suspect she wasn't really seriously trying to win another stuffed animal. :D
Lizardmom and hi_from_sheryl got a bit closer with 9 and 8 respectively, but blog lurker Carolina hit the nail on the head with her answer: 5 bags! Yay!
The tiebreaker, which wasn't needed, was 2 kept and 2 discarded.
Carolina! I need your address, please, so that I can send Findus to you. :) You can leave it in the comments or email me at lizardek a t livejournal.com
Thanks, everyone, for playing along!