Does anyone see a problem with a dog backpack?

I have a 2 year old golden retriever and we always go on long walks we started to go to the Scott's highlands and doing some camping i got her a dog backpack so she could some of her little comforts but someone has told me you shouldn't use them on Golden's and thoughts?? the rucksack she has is made by ruff-ware and its the from the top range so i dnt see a problem