The recoveries of 75 volatile organic compounds (VOCs) typically analyzed as part of the U.S. Environmental Protection Agency’s (EPA’s) Compendium Method TO-15, were evaluated for SUMMA®, electropolished, and silicon-lined, stainless steel canisters. The VOC recoveries were determined both in the presence of dry air and humid air; and under vacuum and pressure over a 30 day storage period. The detailed experimental design, analytical techniques, results, and implications will be discussed in this presentation.