Wolfpacks has a small pack that might be okay to carry very basic stuff: http://wolfpacks.com/products/dogpacks/saddlebags.html

I have looked at dog packs for years, and just haven't found any that I really liked. Too large, too bulky, sit too far back, too hot, fasteners on the chest rather than the top, straps on the side that can catch in brush, etc.

The two things that I think are the most important are that the pack must ride closer to the dog's shoulders than the middle of his back, and there needs to be a quick-release on the top of the pack. If I run across a bear, I want that pack off my dog NOW, and with a buckle on the chest, that isn't going to happen.

I ran across a Rottie wearing a mesh pack many years ago, but the owner had made it herself, and she said the design was ongoing, and maybe some day she would get it right.

Sue