Frozen packs, available in most supermarkets, are usually prepared packs of Chinese snack foods like dumplings and spring rolls.
罐頭是最傳統的包裝方式，優點是保存期長，堅固不易受損。缺點是比較笨重，而且若加工過程不當，容易產生重金屬汙染。冷凍類食品經過急速冷藏，也可貯存相當長的時間。