Newt Scamander's case

Enchanted with an Undetectable Extension Charm, Newt Scamander's brown, very normal-looking suitcase actually housed a huge number of magical beasts in their magical environments. Despite its fantastical contents, there was also a Muggle-Worthy switch which displayed a select number of more modest clothes and papers should it fall into the wrong hands. However, in its true enchanted form, Newt was able to climb into the case down a ladder in order to care for his creatures including a Thunderbird, a Zouwu, two Runespoors and a number of escaping Nifflers amongst many others.