The light weight and low wind resistance would allow higher speeds while using less power, improving fuel efficiency.
That was as far as the horrible weight on her chest would allow.
The weight of the spacesuit allowed him to sink down again.
The weights allow for fishing at deeper depths, from ten up to forty feet.
Its light weight allowed it to be taken about anywhere.
From a practical aspect, its weight allows for easy distribution, and it is easily worn.
However, the added weight of too many feathers does not allow her to fly, run or even walk!
The weight on bit allows you to tune that tendency.
The light weight allowed a small fuel consumption either of gasoline or alcohol.
"The weight of the trunk allows gravity to put the body in balance."