Just to keep the thread going, Outershell and ILE (both above) are great. But don't forget the classic Jandd mini mtn wedge:
https://www.jandd.com/detail.asp?PRODUCT_ID=FMMW
That's what all the cool kids used to use back in the day. It's durable, proven, and inexpensive (and I assume, still made in the US?). They also have larger seat bags, but this is the one that "everyone" had.