I'm not much of a daper bag fan, and there's no way I could get my husband to carry around something that looks like a diaper bag. For a small bag to use everyday, just get a larger purse! It doesn't need to look like a diaper bag to be a diaper bag. All you need is room for a few diapers, some wipes and possibly a change of clothes.
For traevling, I got a backpack, which at first I thought was way too big, but now I like it! I got it at eBags.com and it's made by Okkatots. There's room for just about all of the baby's things for a trip. We used it for Thanksgiving and Christmas vacations and it was great. Best part, since it's a black packpack, my husband doesn't think twice about carrying it! It stands up on it's own and has a front flap that folds down with a changing mat and easy access to diapers and wipes. It has a large interior compartment for clothes, toys, blankets, etc. with several pockets and zippered compartments for smaller things. There are two side pockets for bottles (one insulated) that zipper copmpletely shut so you never even know there are bottles in there and keeps them clean and protected/cool.
I recommend checking out all the bags on this website, you're bound to find something you like. I have bought computer bags, travel bags and purses from this site as well. Lots of choices and good prices.