I grew up using sling style bags. I do not like that i have to change bags often because the back pack area where the slings are sewn in always rips. So i changed to sling bags. They last way longer than backpacks. Yes i carry bricks in my bag.

These days i use an old used IBM leather sling laptop bag as my work bag. Last way longer that any RM300 nylon sling bag i paid for. The insides needs refurbishing though as the lining is all torn up from wear.