It is a personal choice. I personally like the collar to be afixed to the freezer rather than the lid, don't want to have to ever worry about it falling on my head from the weight. Also, if you put the collar on the lid, when you open it up you will have to deal with the beer lines in your way. Also, seems as if you can make the collar much more sturdy and don't have to worry about wear and tear over time making it weak and misshaped.
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