Outdoor Research - 20 L Helium Adrenaline Day Pack. Color Black. Low Stock. On sale for $55.60. MSRP $139.00.. 4.5 out of 5 starsAdd to favorites. 0 people have favorited thisLow StockBrand NameOutdoor ResearchProduct Name20 L Helium Adrenaline Day PackColorBlackPrice$55.60MSRP: $139.00Rating5Rated 5 stars out of 5(4)