The capacity of a leather Quiver

The capacity of a leather Quiver - Leather Garrison Belt Grayscale Photo

My hunters were constantly running out of bolts. A quick Google led me to this page where someone posted that maximum capacity of a quiver was 15, but he was not sure. He also mentioned that use metal bolts to kill the animal in few hits. Its ok, but the question arises:

what is the capacity of a leather quiver ?
can a hunter/marksdwarf hold more number of quivers to maximise the amount of the bolts he can hold ?

dwarf-fortress

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Leather Quiver

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Images: Manuela Kohl, SHVETS production, Mikhail Nilov, Mikhail Nilov