In response to some questions about hooks I was using for my saddlebag, here's a little photo tutorial. Sorry for the crappy photos.
The Barley comes with straps like this one. The basic idea is you start it inside the bag on one side of the dowel, run it out through the hole, then through the loop, then back in the hole in the bag on the other side of the dowel, then buckle it inside the bag. Fine if you've got half an hour to kill every time you lock your bike.
Start with a basic hook you can find at any hardware store (I assume). This one had a metal tab so it would lock better; I took it out to make hooking/unhooking easier. (Yes, I'm that lazy.)
Run the strap through the hook like so. The way I have it, the buckle is on the bottom side of the dowel, so that the slack from the straps head down, rather than getting bunched up at the top. I also position the hook so that it hooks around the front of the loop on the saddle. Much easier for me to get it off and on.
I use two brass washers. The only thing to know, obviously, is that the hook won't fit through them. I use two washers, this leaves as much of the hook as possible inside the bag, therefore keeping the bag as close to the saddle as possible. It looks a lot better, and prevents the hooks from jogging loose.
After running the strap through the hook, run the hook through the washers.
Put the "assembly" in hook-first. The hook goes through the hole; the strap wraps around the dowel.
Buckle it up, then repeat on the other hole.
There ya go!