I don't think you are going to find the answer on his site, you should rephrase the question. A karabiner is a gun, and I don't think this question has anything to do with a gun.
This product is rated by its manufacturer as supporting a maximum weight of 40 pounds.
it can't hold very much weight
It will be printed with how much weight it can handle on the side of the bar.
20 times its weight in liquid
112lbs
it can hold as much weight as it can handle
There is effectively no limit to the amount of weight that aluminum can hold, if you use enough aluminum.
A triangle is a shape. How much weight a triangularly shaped object could hold would depend on the nature of the object.
it can hold up to 2 gallons
Paper can hold exactly 4.5 kg
90lbs
120 pounds