I think that the people who grow sprouts as they backpack desire the health benefits of very fresh vegetables, such as vitamins and enzymes that are at least reduced if not destroyed in storage and cooking. For weekend trail warriors, these may not be a problem. Long distance hikers might benefit more, and that is when I'd be more interested. A pair of Gladware containers layered and the inner one perforated, might be worth playing with at home, then deciding about carrying the set up.

Foraging is ilegal in some places, should you get caught. Pine needle or rose hip tea is supposed to provide Vit. C, as are sorrel leaves. Those, at least, even I can identify, along with raspberries, apples, and blueberries...