Amazon is offering the popular Ninja FrostVault Go Backpack Cooler in multiple colorways starting from $149.49 shipped. These handy backpacks are dropping back down from a $200 full price, with most of the deals we’ve seen taking things to the $150 low on the other colorways, while the charcoal grey model is returning to its $149 low. This is a $51 markdown for this one colorway, while the others are getting $50 price cuts – all of them landing at the lowest prices we have tracked. We also spott