Sling Bag or Back Pack

For those who knew me well enough, I'm a slinger fan. I've been carrying sling bag since late secondary, cant really remb the year. I'm suffering from post slinger syndrome now: Shoulder ache. When I carry heavy loads on my shoulder, my shoulder hurts. I have to change to backpack for now to take care of my shoulders

I know now is the 'Sling Bag Age', BUT

Do take care of your body!

My new Ripcurl backpack: