I bought mine from Black Ice.
Black Ice dog sledding equipment

It fits my malamute perfectly, but they are used to dealing with mals, so that might be why. The model I have has a remove-able pack that removes and attaches just like the palisades.

The main reason I bought from them was that they had the harness I wanted, and I decided to throw in the pack because it is cheaper than the palisades. The problem is that you don't really know what it looks like until you get it in the mail.

I will say that it is nice to be able to just grab the pack off her when we stream cross, or go through thick brush etc. and then put it on again without having to put all the straps back on.