Seat bags.

Any ideas about where I could find a nice size seat bag? Most of the ones I've seen are so small. I'd really like a larger one.

Topeak makes a 2-litre one that is quite easily available...

These guys make great bags and in lots of colors and sizes.
http://www.jandd.com/bikes.asp

You should decide what you want to carry everyday.
Do you want something you can unclip and take with you when you go into a store? Many people have a large bag and a small bag for different types of occasions. Also in cold weather the large bag can carry a jacket, extra gloves, etc.

I have something for smaller. I need something a little larger, like for a lightweight jacket, yes.

Getting all geared up is never ending, but so much fun!!! :p

Some of the bags are also expandable. One of the seat bags is called the mountain wedge I think and you can unzip the bottom and make it bigger. Of course like Lisa says, you can always get two. :D

Rivendel has some big ones:

Seat Pouch

Country Bag

I love the Specialized Wedgie bag. It's quite large and expandable, but narrow so it doesn't get in the way...

You also have to decide whether you want a retro/field-bag type of look or a modern sleek type look saddlebag.

I use a retro/camping look on my bike.
I have a Velo Orange banana bag for small trip uses.
I have a Rivendell/Baggins Little Joe for everyday stuff (medium)- they no longer make these.
I have a Carradice Nelson (large size) for when I ride with several days worth of clothes.
Carradice makes some great bags:
http://www.wallbike.com/carradice/ca...addlebags.html
You might like their Barley bag for normal use with room for a jacket, digital camera, tools and lunch, etc.

Lisa, I think you might have an addiction. :D