Standard Coal Sack
Modern equivalent
112 pounds = 50.802 kilograms
A retail street trade bag legally defined as one hundredweight (112 lbs) to prevent consumer short-measuring.
As coal transitioned from bulk port delivery to household heating fuel, the standard coal sack became the primary tool of consumer protection. Local weights and measures inspectors routinely spot-checked street vendors to ensure sacks met the strict one-hundredweight threshold.