A storage system for a needleless pen delivery device syringe and a hypodermic needle adapted for attachment to and use with the pen delivery device syringe. A tubular sleeve has a first hollow chamber for receiving therein the needleless pen delivery device syringe, and a hollow cap has a second hollow chamber for receiving therein the hypodermic needle. The cap is adapted to affix to the sleeve to form a continuous tubular housing, and the sleeve is adapted to receive the pen delivery device syringe only when the needle is not attached to the syringe. Alternative exemplary embodiments provide for storing other related accessories or additional spare needles.