Infusing tangy grapefruit juice and bitter grapefruit rind into brewers’ Americanized hefeweizen, Backpack Wheat, totally alters flavor profile. Backpack’s lemony orange-peeled banana sweetness gets overrun by hefty grapefruit influence. Like a smoothly pale-lagered Kolsch, mild citrus hop bittering, delicate wheat-dried pilsner malting and wispy green grape esters provide easygoing flow.