Don't laugh till you try it. But for what you want to do pick up one of these for $30 at Cabelas. Many of the packs out there weigh more empty than the weight of the contents you put in them. This is under 9 oz empty. I bought the green with red trim and find myself using it more than the others. And I have several to choose from that cost considerably more.
https://www.cabelas.com/shop/en/ascend-dash-720-lightweight-backpack
