"Scott, you should probably get a seat bag. They come in different sizes, so you can get one big enough to carry all your needs. There are many different styles. Detours makes 3 different sizes of bag that have a thin metal tube around the bag that clamps onto the seatpost. The bag is easily detached from the clamp. (Google ""detours saddle bags"" to find them.) If a smaller bag will suffice, many manufacturers sell various size seat bags. You can go to your local bike shop or try performancebike.com or nashbar.com. My personal advice would be not to get a handlebar bag.

Generally, on the C-SIG, it won't matter if you have a slightly oversize bag. I'm sure some folks will have rear racks with rack trunks. So don't be put off if someone posts a reply saying you should get the smallest possible seat bag. That's fine if you're a fast rider trying to shave weight, but you won't need to worry about that right now. So get what's going to work for you in terms of size and style."

anything that doesn't fit in my seat bag goes into my Bento Box.

I am not coordinated enough to get stuff out of my jersey pockets on the fly.

I second the vote for pockets. I carry a few items in a small seatbag (tire levers, glueless patches, multitool, zip ties, spoke wrench, tire boot), and everything else (tubes, money, snot rag) in my pockets. I learned the hard way that tubes will develop holes in a seatbag, particularly if you don't get flats often and carry a tube for weeks at a time.

And why, may I ask, do you need to carry a Blackberry? Isn't bike riding about getting away from responsibility for a few hours?