Good Questions: Best Diaper (or Non-Diaper) Bag?

Erin's got a list: I am a first-time mom and am looking for a diaper bag. It doesn't have to actually be a diaper bag, but it does have to fulfill the following requirements:

1. Be made of nylon
2. Washable
3. Lightweight
4. Fit over the stroller (I have a Peg Perego Skate)
5. Have at least a few pockets
6. Be reasonable priced (ideally under $150)

(Note: Include a pic of your problem and your question gets posted first.
Email questions and pics with QUESTIONS in subject line to:
nursery(at)apartmenttherapy(dot)com)

Okay, so that's quite a few requirements, but I would think I could find something that would work! So far I have found two Le Sportsac bags that might work but one doesn't fit over the stroller and the other is possibly too big (one is the Travel Tote - 13.75 x 22.5 x 4.5 in, the other is the Medium Weekender -
11.5 x 16.5 x 8.75 in). Has anyone else used either of these? Does anyone have any other recommendations or suggestions? Thanks!

Please let Erin know your favorites in the comments below...thank you!