A descrição física das poções :

Physical Description: A typical potion or oil consists of 1 ounce of liquid held in a ceramic or glass vial fitted with a tight stopper. The stoppered container is usually no more than 1 inch wide and 2 inches high. The vial has AC 13, 1 hit point, hardness 1, and a break DC of 12.

... e de rola :

Physical Description: A scroll is a heavy sheet of fine vellum or high-quality paper. An area about 8-1/2 inches wide and 11 inches long is sufficient to hold one spell. The sheet is reinforced at the top and bottom with strips of leather slightly longer than the sheet is wide. A scroll holding more than one spell has the same width (about 8-1/2 inches) but is an extra foot or so long for each additional spell. Scrolls that hold three or more spells are usually fitted with reinforcing rods at each end rather than simple strips of leather. A scroll has AC 9, 1 hit point, hardness 0, and a break DC of 8.

... não menciona nada do peso dos itens. A página de informações gerais para Itens Mágicos afirma:

[...]When a weight figure is not given, the item has no weight worth noting (for purposes of determining how much of a load a character can carry).

Estou interpretando isso corretamente, já que poções e pergaminhos não têm peso no inventário de um personagem?