The Doctor's Gladstone bag

A series of Gladstone bags were used by the First and later the Seventh and Eighth Doctors on several occasions. The bag included many objects which the Doctor used to escape specific situations.

The earliest account of the First Doctor using one of these bags was on a sand planet, where the TARDIS sunk into an underground cave. In order to pass a watery area in the cave, the Doctor pulled several pairs of flippers in order to allow them to swim across. When his companion and grandchild John was attacked by a giant crab, the Doctor stopped it with an electroliser. The bag was left in the water, and the Doctor left the planet without retrieving it. (COMIC: Shark Bait)

The Doctor brought another bag to a snowy planet, where he met Santa Claus. In order to help Santa Claus make toy TARDISes, he emerged a magic box which could shrink or enlarge objects. The Doctor again left the planet without the bag. (COMIC: A Christmas Story)

The Doctor then visited a desert planet with his grandchildren. He later cursed himself for not bringing water with them in the bag. Upon discovering a grouping of Coconut trees, the Doctor dropped the bag. He left the planet without retrieving it. (COMIC: Plague of the Black Scorpi)

The Seventh Doctor lost a Gladstone bag after fleeing from a swarm of prototype robots. (PROSE: Companion Piece)

The Eighth Doctor used the Gladstone bag to carry the tools he needed to arm the nuclear bomb inside Fatboy. (PROSE: Eater of Wasps)

The bag contained medical equipment including a stethoscope and healing ointment. (PROSE: Timeless)

It later contained Gobstoppers, Fizz Bombs, Jelly Babies, an Eagle comic from the 1950s, and a psionic beam locator. (PROSE: The Deadstone Memorial)

When dreaming of adventures with John and Gillian, the Eighth Doctor carried the bag. When he woke up, he found it under the console in the TARDIS. (COMIC: The Land of Happy Endings)