for me, since she need one whole tin, i will just bring it. packing into ziplock bags are messy and troublesome and if the bag "burst" or tear, then very headache.
if you find the big tin bulky, i would suggest i pack them into 2-3 smaller containers/tupperware. they r more air tight (than ziplock bags) and also can prevent spilling.
you can also carry them arnd when you r out.
just bring the scoop along will do.