I used to have one of the original Messenger Bags (V1) with about 15L volume. I absolutely love that bag and I kept it for 7 Years until the zipper started to fail. I did get a replacement with a V2, which unfortunately is "only" 13L... I must say I really do miss those 2L... Otherwise, the bag is in my opinion the best on the market! Keep up the good work!
Disclaimer: I am big fan of PeakDesign products already, but I just purchased the Everyday Messenger and love it! Different than the backpacks and slings that I have, it provides that perfect in-between, allowing me to carry camera equipment, or just office stuff on the go. I recently used it as an overnight carryall and it was perfect for just the basics, and of course, the cleverly designed and useful pockets and pouches and the light weight overall. A new go-to bag for me!
These bags are built to last like all PD products. In the model I own, there's enough room for a camera, a couple lenses, and my 13" laptop. This is great for business, commuting on bike, and going on photo walks.
This is the camera bag I have been looking for all my life. It has it all including places to put things like pens (remember them). On the outside it looks anonymous and not like a camera bag. Inside it is grey so you can actually see things and the magic folding dividers really work and can be changed in a trice and allow you to put things underneath. I can carry ALL my rangefinder equipment plus the laptop and charger. The strap doesn't cut in and feels silky and is easily adjustable. The clasp really works and shuts firmly but is also easy to open one handed. This bag knocks all other bags into a cocked hat to use an expression.
I have just purchased the new 13L Everyday messenger bag and it is fantastic. Excellent for carrying my Canon R5 plus lenses. I also use this for work as it is so functional. Peak Design look at every tiny aspect of what a bag should be and I think they have completely nailed it. Perfection personified.