What is the carrying capacity of a large pouch, small pouch, backpack and so on?
- Am I actually playing AD&D 1e: yes
- Have I read the rulebooks: yes
The last page of the Advanced Dungeons and Dragons Player Character Record Sheets accessory (TSR Stock # 9028) includes the following table:
Container Volume G.P. Equivalent
Small pouch 1/4 cu. ft. 25 g.p.
Large pouch 1/2 cu. ft. 50 g.p.
Small sack 1 cu. ft. 100 g.p.
Backpack 3 cu. ft. 300 g.p.
Large sack 4 cu. ft. 400 g.p.
Since the Players Handbook already lists other, much smaller numbers for the actual encumbrance of the containers themselves, the implication is that the G.P. Equivalent values are for the containers when fully loaded.
Also, these numbers match the encumbrance example given on page 225 of the DMG, which describes dividing 700 gp amongst 1 large and 3 small sacks.