I use the Carradice SQR. Like it a great deal. Waterproof. Comes off on one easily. Plenty of room and 3 (I think) sizes. Two issues: 1) you need enough seat post height to mount it...at least 5 inches and 2) ensure you put the weight of anything you are carrying toward the seat post. If not balanced, there can be some instability, particularly felt on descents.
Bellevue, WA USA
>A couple of people have mentioned Carradice bags. I know you're carrying a
>laptop, which a Carradice bag probably isn't that great of a size/shape for
>(maybe one of the larger ones) but you might think about using a Carradice
>anyway, and carrying your computer on your back. There are plenty of
>elegant, compact backpacks available for this that won't weigh you down,
>and you can use the Carradice for everything else.
> If you're going to use a Carradice for commuting, I highly recommend the
> SQR mount, which makes it a piece of cake to take it off and carry
> around. Wallingford, Harris, Peter White, etc, should all have them. The
> advantage of carrying your computer on your back is that it's subjected to
> a lot less shock from bumps than if it were attached to the bike.
> If you want to carry it on the bike, Arkel makes a really nice, secure
> pannier for a laptop. My better half has one, and it's one of those rare
> items that I don't feel the need redesign in my head when I look at it.
> But for simplicity and good looks, and not needing to attach a rack, you
> can't beat a Carradice. The straps are kind of a pain to undo all the
> time, but the SQR mount takes care of that.
> Emily O'Brien
> commuting daily from Medford, Massachusetts, USA