Hi , tumble grain is a little less grained than Darwin . Darwin is now named natural vegetable tanned , i have images of cabbages , much prefer the name darwin .The care card of tumble grained says "" this is a vegetable tanned leather . It is a natural product , which means you can see the individual grain pattern of the skin that makes each bag unique . It ages naturally and becomes more characteristic with use "" sounds similar to the care card of darwin .