Medkit

From Memory Alpha, the free Star Trek reference

Medkits (also known as medikits) are pouches used by Starfleet medical practitioners and officers that contain medical equipment for away teams.

In the 2260s a medkit was carried separately from the medical tricorder as a supplement. It contained a hypospray preloaded with up to six drugs in suspension, such as cordrazine, Masiform-D, a neural paralyzer, sterilite, melanex, and tri-ox compound. Also included was a spray applicator, a medical scanner, and a palm-sized reader tube.

In the 2370s, the kits were more complex, containing a medical tricorder, a hypospray, a dermal regenerator and trauma kit for emergency medical situations.

They are often kept in strategic positions around Starfleet vessels and bases. The USS Voyager had one located behind the tactical console on the bridge. (VOY: "Projections")

A more compact medkit was also employed by Starfleet. It was about the same height as a standard medkit, but not as wide. (VOY: "The Gift")

While stranded on a moon in the Gamma Quadrant the away team was held prisoners by the Ennis. Doctor Julian Bashir tried to get his medkit from the Ennis Nima back to treat the wounded Major Kira Nerys. (DS9: "Battle Lines")

The USS Enterprise-D kept extra medkits on hand for relief missions. To prove her loyalty to the Maquis, Ro Laren stole a large quantity of them in 2370. (TNG: "Preemptive Strike")