Women typically carry purses around, and over time these bags become heavier.  These heavier bags can cause harm, in terms of imbalanced skeletal stress and pain.  Consider and prioritize the contents: a wallet, cosmetics, glasses, charging block, office supplies, water bottle, etc.  And for the busy traveler, add in a laptop, charger, a meal, hand sanitizer, and so on.  The correct weight of a bag carried everywhere is the weight of a newborn.  Anything more than this can sway your balance from your shoulders to your hips, impacting your back and spine.  In order to maintain that natural curve of our spines, we have to activate the muscles that allow us to be aligned with ease.

Carrying a bag over the same shoulder day after day is not recommended.  Think balance and alignment.  Alternate the sides you shoulder a bag or use a cross-body bag or backpack.  The backpack is the best choice allowing full symmetry as your body comes together to shoulder the weight.  The second best option is the cross-body which allows a close body fit, less stress to the spine, and a load that is symmetrical to carry.  The third choice is to alternate a bag across the shoulders.