Product Lids for Snow Peak Mugs?

Can't help you with a 450 or 600 but for the 700 a Maxwell House 'flavor lock lid' that comes off a 11 oz. can is great fit.

Hey! I recognize that gear from your thread over on that knife forum. In fact, because of that thread, I bought a SP 450 yesterday! In answer to your question…

Until yesterday, I only had the 600. I found a review that said the lids in the link fit perfectly. According to the link, you have to buy 6 at a time. If you get some, you have to send me one for the tip. :)

Here's the link:
http://www.villagekitchen.com/luminarc_green_lids_working_glass_576_prd1.htm

I know a Folgers coffee can lid fits the 600 like it was made for it. Here's an excerpt from one of my own posts on that other forum.

"The lid from a 11.3 oz. size plastic can of Folgers coffee snaps perfectly onto the top of a Snow Peak 600 cup. Using a leather punch, I put two holes opposite each other on the lid. Small hole on one side. Bigger hole on the other. It works perfectly, and weighs .4 oz aka 10 grams. Cost: under $4 if you don't drink coffee. Free if you do.
Someone had tried using it as a cooking lid and it worked fine. Someone else tried and the lid deformed. Maybe you just have to be really careful. In any case, for the weight, I'm willing to pack it along with a cooking lid."

Here's my SP600 with a 11.3 oz folgers sipper lid.

I just read that the bottle for Jameson 12 year old whiskey comes in a canister, and that the lid of the canister "fits the SP 600 perfectly."