Abstract: A containment boom 200 is disclosed which is comprised of a flexible pouch 201, which is a PVC pouch 201 having a mouth 202 that can be closed by manual closure device such as Velcro closing, and a floatation 103 such as a foam which is inserted into the pouch 201. One or more belts 203 can be cinched around the pouch 201 to secure the floatation 103 in place. The floatation 103 can be assembled in a location near a crude oil spill in the sea as there is no need for tools to seal the pouch 201. This drastically reduces the costs of transporting a pre-assembled containment boom 200 from a factory located far away.