I picked up a Stillman & Birn 3.5" x 5.5"; small, pocketable, 48 pages.
The plan is to do 4 to 6 drawings a week. At that pace, the notebook fills in 8 to 12 weeks. When it's done, I'll post the best 3 here.
I'm motivated by what I see on /r/penandink, /r/urbansketchers, and to a limited degree /r/sketchdaily.
I'm trying to keep this low stakes. Most of what goes in won't be good, and that's fine. Quantity over quality. Let's make the first 5% of the 1000 that you throw away. Setting an alarm for July 3rd.