In part it is so no luggage is too heavy to handle. There is people who move the luggage by hand in several places. The individual weight of luggage is important for this reason.
Get a small portable luggage scale and use it to weigh your bags. Put it then in your bag so you have it with you for the return trip. The are cheap, light and easy to use. The one I have uses a surprising amount of battery so I have an extra button cell battery to it taped to it so I have a replacement,
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