Or my pocket, "mkoba" is slightly suitable for bag while mfuko for pocket
That is true but a mfuko is a plastic bag that is used temporarily, a mkoba is a bag this made of more sturdy materials that can be used over and over again.
Memrise taught me „begi“, which is obviously easier to remember. Can I use it in real life? Also which class is it then? Same with daktari/madaktari?