The link to the Traditional 2 Cooke Custom Sewing Pack does not work..also the dimensions for the 2 are correct but the volume given is for the 4.
here is a link to the CCS page that shows the 2, 3 , 3 1/2 and 4. Dan has a bunch of sizes.
http://www.cookecustomsewing.com/traditional.htm
I found some of his others on envelope packs. I have seen all the sizes. All stand up so all should be under traditional
Thats a pile of work you did!
Let me give you more: Under Dry Bags, Outdoor Research, Seattle Sports and (watch out for this one) Sea to Summit (they have coated compression, sil nylon etc. In my local outdoor store there are over three dozen different dry bags by them)
When you get to drybags, you might want to break them out by usage. The PVC ones can be used externally. Some of the coated ones are designed to slide into a pack more easily (the PVC ones are a real pain to compress). Some of the dry bags by Seattle Sports and OR are compression dry bags.
Hmmm