a method for liquid spill containment utilizes a collapsible and reusable spill containment bag which is flexible and includes a main body portion and a tubular extension portion at the upper end thereof . the extension portion which can be folded or inserted into the main body portion enhances the storage capacity of the bag and may form a closure for the upper end of the bag . engagement means are provided on both the main body portion and the extension portion . in using the bag , the engagement means are used to suspend the bag in various positions on a tanker truck with a liquid transport system to receive or contain a leak . the containment bag may also be utilized to collect liquid leaking from a drum or barrel .