Choose a handbag that is proportionate to your body size (this rule applies in elegance and fashion as well!).
Preferably, choose a lightweight bag to best minimize the weight you are carrying around.
Don't purchase a big bag, you'll only be tempted to fill it.
Alternate shoulders by switching the bag from side to side.
Do not slump your shoulders when you are carrying your bag on your shoulder. It adds to the strain.
Don't let your bag cause you to lean to one side.
Your ergonomic shoulder bag should not interfere with your motion.
Use a bag with padded straps to help distribute the weight and pressure across your shoulder
Go for wider straps.
Reduce the load you carry around by constantly 'editing' your wallet, purse or bag. Carry only the bare essentials.
If you must carry an item, try to get the travel size option.
If you can, try to carry smaller bags.
Pick the bag that allows you to alternate carrying on your shoulder, around your wrists or by using its handles.
Leave your loyalty cards in your glove compartment of your car or a 'shopping' bag (bag that you use when you go shopping)
If you cannot seem to reduce the weight of your bag to about 6 lbs (3 kg) or less, consider a backpack. A backpack is more of an ergonomic bag since it distributes the weight between your shoulders