The present invention provides a vascular insertion sheath with collapsible penetration locators. The collapsible penetration locators provide the insertion sheath with a small outer diameter and the added functionality of precise location indicator. The collapsible penetration locators comprise thin membranes that collapse upon insertion of a sealing device or vascular instrument into the insertion sheath. The insertion sheath includes a reinforced wall according to some embodiments, with a coiled or braided filament for reinforcement.