PetAmi Dog Backpack Saddle Bag for Medium Large Dogs, Saddlebag for Dogs to Wear, Harness Saddlebag for Hiking with Reflective Safety Side Pockets, Vest Dog Pack for Camping Travel (Green, Medium)

if your breed is not a big breed definitely go with med. I have a bigger than usual Australian Shepherd and Large fits him great, but I had to snug it all the way to the end of the adjustments for it to give him a perfect fit. it's a well built product has lots of storage and pockets the bags are collapsible as well if your carrying none bulky items you can slim it down for your dog. the padding underneath is breathable and made of strong nylon mesh. the stitching is rugged and thick nylon is used in stitching. I think the zippers could have been more heavy duty I would not over stuff the bags then try to zip. it might break the zipper. under normal use I think they will hold up. just think the manufacturer could have went with a durable zipper to go with the rest of the durability built in. it's a well built product comfortable fit for my dog it does not bother him to ware it for hours, he bumps them on things like door frames and going around trees but think that is a getting used to thing. the fit is what most impressed me Jasper likes them! and they seem definitely rugged enough. dont let the zipper deter you. all in all this is a well built product at an ok pice(everything is still priced way to high since COVID) and the manufacturer definitely took comfortable for the dog into mind with the way they designed these saddle bags. I would recommend this product. I would purchase this product again if needed