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A futon is a Japanese padded mattress that can be rolled up for portable uses much like a sleeping bag.
it can't hold very much weight
Organic futons cost about as much as any midrange futon. The nicer the materials, the more plush, the more it will cost just like any other futon. You can buy a full size futon mattress from Northern Naturals for just under $500.
Weight will vary depending whether you are looking for a 3ft single, or 4ft6 double. Some futon retailers use bits of offcut foam and these weigh less. EG - Futon mattresses from Comfy Living are stuffed with 4 layers of fillings (felt & wool) so are quite heavy, for a standard 4ft6 double size, the weight is around 12kg. The luxury thick mattresses 14cm thick obviously weigh more.
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