Embodiments described herein provide a downhole tool (e.g., a retrievable bridge plug) that includes a sealing device and a load retention/equalization mechanism. The sealing device includes an elastomer seal component and an expansion device configured to radially expand outwardly to compress the elastomer seal component against a wellbore casing within which the downhole tool is located. The sealing device further includes lower and upper support barriers configured to radially expand outwardly against the wellbore. The sealing device also includes a seal energizing spring configured to maintain an initial setting force of the elastomer seal component against the wellbore casing. The load retention/equalization mechanism includes a spool/inflation valve configured to direct fluid into an internal volume to inflate the elastomer seal component radially outwardly based on a differential pressure between a first volume uphole relative to the downhole tool and a second volume downhole relative to the downhole tool.