Objects placed within the bag weigh only one-tenth of their normal weight, and thus this item is very useful in preventing a character from becoming over-encumbered. However, each bag has a weight limit (the maximum weight that can be carried inside it), calculated as follows: 2D6+6 x 100 Encumbrance. In addition, no living creature or item larger than 1 foot in its largest dimension can be contained within a Bag of Lightness.