In the world of Meridian, the weight of an individual item is compared to an emerald (ems). An individual with a maximum Might stat of 50 can carry 2500 ems. To break this down to a ems per might point simply take the max capacity (without super strength cast upon yourself) (2500) & divide it by max might (without super strength cast upon yourself)(50) and that equals 50. Now that we have established that a "might point" is 50 ems we now know that 10 might is 500 ems and 12 would be 600 ems and so on.
Throughout this reference site, each object will have a weight comparison, in ems, associated with it.
I understand that metal chests (in guild halls) can hold around 6000 ems, and the wooden ones can hold around 4800.