I had made one of those early on too, I just hated how hard it was to zip up when it was full. Just went looking in the DIY thread for it and was reminded of the beautiful oar locks you designed, wow:I did similar, but just made mine slightly longer than needed...skipped the teardrop ends and just made it "envelope" style.
I'll have to find a pic.
the bags that come with K-pumps are an awful design. K-pump needs to ship a bag like these, even though they'd cost a bit more.
The ones MT4 made have larger balls on top than the Sawyers do, but it's nice to see they make these. Interesting thing is they describe it pretty much like they do the cobra, which I'm not a fan of...Funny thing is that I just bought some Sawyer Canyon locks that look like a version of your design!