It seems that there are many things that should be volume 0 especially when compared to items with volume 1. In the experimental any kind of drug has volume 1, even one dose worth. Rolling papers have a volume of 1. In comparison a pair of socks, a pair of work gloves, a punch dagger, all have volume 1 as well. In reality you could carry many doses of whatever pills or drugs or rolling papers in the same volume as a pair of wool socks. It doesn’t make a great deal of sense, especially when ten pills of the the same drug has 1/10 the volume as 10 pills of different drugs.