I ended up ordering the icebreakers from Cabelas but when they arrived they look like flinstone boots. They are a lot bigger that I thought. There would have been no way that I could pack them in my daypack.

I sent them back to Cabelas and bought the arctic sheild boot covers from sportsmans warehouse. These will easily pack up in my daypack. Hopefully they will keep my feet warm when sitting. I did buy some of those toe warmer packs to throw in there just in case.