In regards to the Heys I went to Zellers to take a look at one and didn't like it. It feels cheap and I think the strap would bug my kneck.
On the plus side I happened to be in
Walmart yesterday and found a Buxton bag that I think I'm going to love! It was only 14.98 so I grabbed it. It seems like it would be waterproof (or water resistant anyway) and has lots of compartments. The main thing I was worried about was getting a water bottle in it but I tried one in it out of the store cooler and it fit!!
I'll try and post a picture of it soon.