The SKC Vac-U-Chamber is a rigid air sample box allowing the direct filling of an gas sample bag using negative pressure provided by most personal air sampling pumps. When using the Vac-U-Chamber, the air sample directly enters the bag without passing through the pump, thus eliminating the risk of contaminating the pump or sample. The Vac-U-Chamber has rigid walls that will not collapse under vacuum conditions and eliminates possible errors. All surfaces in contact with the sample are constructed of stainless steel or Teflon.