Abstract: Described is a collector/reservoir made of flexible and chemically-resistant material. The collector/reservoir has an open top, and side walls which are quickly inflatable with air or some other gas or fluid. When the side walls are inflated, the collector/reservoir quickly obtains more shape and rigidity, and it may be easily placed under the source of the spill to collect the spilling material. At, in or near its bottom, the collector/reservoir is provided with one or more conduits from its interior volume to its outside surface, each provided with a quick-connect fitting. This way, the spill material from the collector/reservoir may be drained to another storage or transport reservoir connected to the collector/reservoir by the quick-connect fitting.