Abstract
We give a simple proof and a generalization of the classical result which says that the (asymptotic) approximation ratio of BestFit algorithm is 1.7. We generalize this result to a wide class of algorithms that are allowed to pack the incoming item to any bin with load larger than 1/2 (if it fits), instead to the most full bin, and at the same time this class includes the bounded-space variants of these algorithms.