One of the best pieces of gear for any dog is the dog pack and my recommendation for any day walk/hike is the Approach Dog Pack by Ruffwear is the top choice.
Whether your dog has ever worn a back pack or not, they seem to like the fit of this pack and find it easy to take a nice long walk or hike with. Anytime I'd grab the pack and walk toward my dog, he got very happy because he knew it was time for a good long walk. Its a great place to store used poop bags if you have no trash around. I also always had some water for him in the other pocket along with his collapsable water bowl, which fit in there very nicely.
As for pricing, this pack came in at a reasonable $79.95 which you can get over at Amazon by clicking on this link.
I'll make sure to keep this page updated. I will be regularly testing out new packs and showing off my rescues with their packs to show you just how amazing these packs are and how much a rescue dog can actually love them.