The ornamental design for a petburial or cremationbag, as shown and described.
FIG. 1 is a top side plan view of my new design for a pet burial or cremation bag, in an open, unfolded first configuration;
FIG. 2 is a bottom side plan view of my design of FIG. 1;
FIG. 3 is a top side plan view of my design, in a second configuration, with an inside layer folded closed and with ties tied together;
FIG. 4 is a top side plan view of my design, in a third configuration, with an outer layer folded closed over the inner layer and with buttons buttoned up and with ties tied together; and,
FIG. 5 is an upper perspective view of my new design of FIG. 4.
The features shown in broken lines are for illustrative purposes only and form no part of the claimed Design. No claim is made to texture, surface finish, or surface ornamentation.