The invention relates to novel methods and compositions for the detection of analytes using the nuclear reorganization energy, \u03bb, of an electron transfer process. A first handle can be folded from the upper plane and a second handle can be folded out of the lower plane in opposite directions so that the two undersides of the handles lie directly opposite one another in the folded-out position and together form the carrying handle for carrying the folding box for carrying. The container walls are also relatively thick, for the same reason.