%exstorage_space% - Displays the maximum storage space.
%exstorage_space_formatted% - Same as above, but formatted.

%exstorage_used_space% - Displays the total amount of space used.
%exstorage_used_space_formatted% - Same as above, but formatted.

%exstorage_free_space% - Displays the total amount of free space.
%exstorage_free_space_formatted% - Same as above, but formatted.

%exstorage_used_percent% - Same with used_space, but in percentage.
%exstorage_used_percent_formatted% - Same as above, but formatted.

%exstorage_free_percent% - Same with free_space, but in percentage.
%exstorage_free_percent_formatted% - Same as above, but formatted.

%exstorage_quantity_<material-key>% - Displays the quantity of the item, or -1 if it doesn't exist.
%exstorage_quantity_formatted_<material-key>% - Same as above, but formatted.