Medium actually doesn't hold a lot. I thought it would be adequate but maybe my wallet is too thick in size and it seems to have taken much space already after I've put it in. I can only put my wallet, phone inside... for the cosmetics, I need to place them into a smaller pouch as my usual cosmetic pouch can't really squeeze inside.
Jumbo will be more practical for everyday use. Also, the sales advisor recommends caviar for Jumbo for versatility.