Dashi Packet (だしパック) is very convenient when you want to make dashi quickly for your miso soup or any other dishes that require dashi.
Finally, Kayanoya Dashi (pic above) is here in the U.S.! I think this dashi has the best flavors among all the dashi packet I’ve tried. You can purchase it on Amazon or local Japanese grocery stores (I get mine from Nijiya).
You can buy the following dashi packet as well.
Watch this video to see how you use it.