Okay, the Oi Ocha Koicha did turn out to be a very impressive iced green tea, particularly for something coming out of a bottle. Sadly couldn't find the Himemaru snacks but did get a mix that included some similar style that I can see the allure of particularly paired with that tea's flavor. Cheers on the suggestion -- it was a snack that hit the spot after a few hours of hiking around in the snow.