Too many items of the designated types can be put in containers. For example, 50 arrows can be equipped at once to a quiver, 50 pints of oil equipped to a flask, and 10 vials of ink to a vial.
In 6.00.0, it seems to fairly consistently remove the now too-full containers from the drop down list of where more of that type of item can be equipped (in 6.01.02 this doesn't seem to happen, at least not consistently). But, it is still possible to put 1 "Arrows (50)" and then 50 individual Bolts into the quiver that already has 50 individual arrows. Then again, it had no trouble with taking 25 javelins followed by another 25 javelins (the quiver option did not disappear for the javelins).
Similarly, 50 poisons can then be added to a too-full vial but not to the too-full flask, which no longer showed on the drop-down window.