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Pic related is basically why fit, waist and sternum straps are important on your rucksack for hiking. The waist straps really help lift the load off your shoulders and make the whole thing so much more enjoyable.
OP your bag is fine for walking to work or going to class or something but when you are /out/ you are typically dealing with rough, alternating terrain and you need a bag that responds well and works with you as your body moves as you adapt to the terrain you are working through. You'll find yourself twisting, ducking, scrambling, crouching, leaning, bending and pretty much moving in all ways it is possible to move.
Another important feature are external compression straps. While, shoulder, waist and sternum straps keep your bag close your body, the external compression straps keep the contents of your pack still and as close to your center of mass as possible. This keeps you balanced and makes it less work to carry. One thing you dont want is stuff moving around in your pack as you walk or things hanging off your bag and swinging around like a pendulum as you move.
