I posted this up on BPL, but figured I'd post here too.
I thought I'd share a find of mine today. I found a black plastic coffee cup at work today in the office. Well, I picked it up and it felt super light. Took it home to weigh and here are the results...
.8oz
1.8oz
That is a 1 ounce savings over the GSI cup. The cup is very durable, resists heat and doesn't warp. Holds 8 ounces, which is perfect for a cup of joe. They are made by a company called WNA and they are supposed to be disposable. I found a pack of 8 on Amazon for $9.69 shipped.