Thule sling backpack - black one lasted about 20 years and zippers are having problems. Blue is probably the last backpack until I die (60M) : r/BuyItForLife
Sapling Sling Pack BLACK | Buy Sapling Sling Pack BLACK here | Outnorth
Thule Sling bag Crossbody Aion 2L Shoulder Chest One Strap Backpack | eBay