A catheter assembly (10) comprising: a hydrophilic urinary catheter (16) having a catheter shaft including a proximal insertion end portion (22) and a distal end portion (24) having a drainage member (26), a collapsible sleeve (12) defining a compartment (14) that contains a portion of the catheter shaft, a distal end portion (32) of the sleeve (12) being attached to the distal end portion (24) of the urinary catheter (16); an amount of liquid (20) located within the compartment (14); an introducer (28) located at a proximal end portion (30) of the sleeve (12), the introducer (28) including a passageway therethrough and a proximal opening for passage of the catheter shaft therethrough; and a removable cap (46) covering the introducer (28) wherein the cap (46) includes an anti-leak element.