The main fabric might look familiar -- I was inspired to use essex linen after seeing this one, this one and of course this one. For the pocket, I used some of the Stamped fabric that I won in a giveaway over at the Long Thread awhile ago. I love it, it's so cheerful! (Ellen has a new line coming out soon -- it's called Garden and it looks equally fabulous).
My mom said she would never carry it messenger-style, so I just used a 21" strap for hers. For mine, I figured out how to use the adjustable hardware (not difficult but I just couldn't wrap my head around it the first time around). I used scraps of quilting batting to pad the straps instead of interfacing and I love the way it turned out, so much nicer to carry.
I love having an outside pocket for my keys and this time I used a magnetic snap instead of velcro. I added a water bottle pocket inside again because it's worked really well in my other one. I used duck cloth for the interior just for it's durability and this time made sure to match the top of the lining to the outside. It's a great pattern and gives a really professional looking bag.