There are many different styles and sizes of mirror clips. The package you purchase them in will usually give you the range of weight it will hold.
112lbs
it can hold as much weight as it can handle
A Command Strip can typically hold up to 7.5 pounds of weight.
it can hold up to 2 gallons
Paper can hold exactly 4.5 kg
Gorilla Super Glue can hold up to 30 pounds of weight.
The Golden Gate Bridge can hold up to 38,000 tons of weight.
90lbs
120 pounds
1.683 grams
About 50,000 lb.
The answer is simple, the amount of weight a boat can hold depends on how big your boat is the bigger the boat the more water it displaces the more weight it can hold.