Ok, so the rulebook explains four different weight categories: Heavy, normal, light and tiny. ...And then it mentions that alcohol works with a different weight system as you can have up to ten doses in a bottle that is a normal item AND then you also have grub and water which don't fit any of the former categories and instead they are 1/4 normal item...
...And when you get to the end of the book and look at item stats there is a thing called "weight" and rather than using any of the former names it simply gives each item weight a number. ...Which is simple enough, something that has been previously mentioned as a heavy item has "2" and normal items have "1" and so on.
EXCEPT that you also get items like arrows that have the weight of "1/4." I assume that they use the same system as grub and water, is this correct? Why couldn't you stick to just one method of naming item weights? You could have just used the numbers from the start as it seems simple enough but instead there are four different named weight/encumbrance levels for items and apparently five different encumbrance levels in total.