Leather is actually not a great material for a backpack or an outdoor (non-dressy) shoulder bag from a practical perspective in the 21st century. Nylon and related synthetics is a lot more practical. If you gave me a leather outdoor bag I'd probably thank you nicely and stick it in a closet or sell it.

I do like leather wallets though I almost exclusively use small front pocket ones these days because of sciatica and minimal needs for carrying either cash or a lot of cards.