A kind of pet knapsack is suitable for being put into for a pet, and includes a knapsack ontology and an installation unit. The knapsack ontology includes coating member and the Hou coating member that can connect with opening with the preceding coating member before one, which defines an accommodating space that the pet is accommodated with what with the Hou coating member jointly. The preceding coating member has the mounting portion of a mounting hole for defining the connection accommodating space. The installation unit include a replaceable the what mounting portion is set and covers the mounting hole with what and the first transparent installation part. By the transparent design of first installation part, which can see the external world from the accommodating space, and pet is made to generate the sense of security.一種寵物背包，適用於供一寵物放入，並包含一背包本體，及一安裝單元。該背包本體包括一前包覆件，及一與該前包覆件可開啟地連接的後包覆件，該前包覆件與該後包覆件共同界定出一用於容納該寵物的容置空間。該前包覆件具有一界定出一連通該容置空間之安裝孔的安裝部。該安裝單元包括一可拆換地設置於該安裝部並用於覆蓋該安裝孔且透明的第一安裝件。藉由該第一安裝件的透明設計，該寵物能自該容置空間內看到外界，使寵物產生安全感。
