You can avoid these a great deal by simply converting to a rolling backpack so it will take the stress of your back and help you stay healthier and with more energy.
Rolling backpacks work great for school and work.
Whether you are carrying heavy books or your laptop computer.
It will take the stress of having to walk around campus with these heavy loads and simply allow you to roll your backpack behind you.
If you will be using your backpack on an uneven surface like grass, dirt or snow then a rolling backpack might not work as well and in those instances you will most likely just need to use a regular backpack.
If you are on those sorts of surfaces you will be most likely camping or hiking and a rolling backpack would most likely not be what you you needed anyways.
The only times you can't use a rolling backpack to save time and energy is in smaller, more narrow places or if it's extremely crowded they might not want people tripping over other people's backpacks.
A lot of backpacks will have detachable parts and bags that you can take off the pack and store things that you will need to carry around but don't want the entire backpack with you.
It's perfect for cameras, keys, wallets, etc.
A good rolling backpack will most likely run you a little bit more money but in the long run it's worth it because it can help you save time and energy and it's to be expected.