Interior Dimensions
14.62" x 10.18" x 4.25" (L x W x H not including lid depth, according to Pelican website) It's actually slightly bigger than that because they factor out the curved portion where the base meets the side walls. Lid depth is 1.75".

My 2 power supplies measure 10.5 inches from side to side and fit (just barely) in the "10.18 inch" space by spacing up off the floor of the case. I was planning on spacing them up anyway for airflow.