The Doctor's Gladstone bag
was used by the Seventh
and later the Eighth Doctor
on several occasions.
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)