The Ultimate Direction Signature Series SJ Ultra Vest is the result of collaboration with Scott Jurek, the world’s most dominant ultra runner. Weighing in at 7.5 ounces (13 with bottles) and offering 9.2 L of storage space, the SJ has the best weight-to-capacity ratio of any hydration pack on the market.
I’ve been using Ultimate Direction packs for years, modifying them to carry bottles in front…the Ultra Vest is the culmination.
Ultimate Direction: Scott Jurek Ultra Vest Video
- Small - 25-31" (63.5-78.7 cm) chest (When in doubt between small and medium, size up to allow for great storage capacity.)
- Medium - 31-38" (78.7-96.5 cm) chest
- Large - 38-43" (96.5-109.2 cm) chest