 A final motivation for imprecise probability is that evidence doesn’t always determine precise probabilities (Levi 1974, 1983; Walley 1991; Joyce 2005; Sturgeon 2008; White 2009; Elga 2010). Assume a stranger approaches you and pulls three items out of a bag: a regular-sized tube of toothpaste, a live jellyfish, and a travel-sized tube of toothpaste; you are asked to assign probability to the proposition that the next item he pulls out will be another tube of toothpaste—but it seems that you lack enough evidence to do so (Elga 2010).