Black, green and blue are usually considered well accepted colours. On a practical level, yellow shows dirt easily and you'll always have a dingy look about you after the first trip.
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You're going to set down on the floors or other places that's going to be dirty. You may throw it in the trunk of your car. White gets dirty quicker than any other color!!
When carried, a backpack should rest snugly against the back. Additionally, a backpack should be positioned so that it is high on the back. Adjust the shoulder straps to properly position the backpack, and utilize the sternum strap and hip belt to help distribute the weight to relieve shoulder and back discomfort.
As most administrators know, schools have been barring backpacks for years to prevent students from concealing weapons and other potentially problematic objects.