Outdoor Research - 20 L Helium Adrenaline Day Pack. Color Black. Low Stock. On sale for $93.10. MSRP $139.00.. 4.3 out of 5 stars5 left in stock+2Brand NameOutdoor ResearchProduct Name20 L Helium Adrenaline Day PackColorBlackPrice$93.10MSRP: $139.00Rating4Rated 4 stars out of 5(3)