ITEM TYPE STORAGE CODE: A ONE POSITION ALPHANUMERIC CODE THAT INDICATES THE TYPE OF STORAGE SPACE AND ENVIRONMENT CONDITIONS TO BE MAINTAINED FOR AN ITEM DURING STORAGE AND SHIPMENT. IN ACCORDANCE WITH DOD 4100.39-M, VOLUME 10, TABLE 182 AND DA PAM 708-2, TABLE 3-20.
Governing regulation: HTTP://ARMYPUBS.ARMY.MIL/EPUBS/DR_PUBS/DR_A/PDF/WEB/P708_2.PDF /N
Code values (32)
| Code | Meaning | Definition |
|---|---|---|
| 2 | Medical Controlled Humidity | MEDICAL CONTROLLED HUMIDITY ??? NOT TO EXCEED 40 PERCENT RELATIVE HUMIDITY. |
| 3 | Medical Controlled Room Temperature | MEDICAL CONTROLLED ROOM TEMPERATURE ??? 68 F TO 77 F (20 C TO 25 C). |
| 4 | Medical Freeze | MEDICAL FREEZE ??? -13 F TO 14 F (-25 C TO -10 C). |
| 5 | Medical Refrigerated | MEDICAL REFRIGERATED ??? 36 F TO 46 F (2 C TO 8 C) (DO NOT FREEZE). |
| 6 | Medical Refrigerated Vault | MEDICAL REFRIGERATED VAULT ??? 36 F TO 46 F (2 C TO 8 C) (INCLUDES SCHEDULE II DRUGS) (DO NOT FREEZE). |
| 7 | Medical Refrigerated Secured | MEDICAL REFRIGERATED SECURED (INCLUDES CONTROLLED OR LIMITED ACCESS) ??? 36 F TO 46 F (2 C TO 8 C) (INCLUDES SCHEDULE III, IV, AND V DRUGS) (DO NOT FREEZE). |
| 8 | Medical Controlled Room Temperature Vault | MEDICAL CONTROLLED ROOM TEMPERATURE VAULT ??? 68 F TO 77 F (20 C TO 25 C) (INCLUDES SCHEDULE II DRUGS) EXCURSIONS ARE PERMITTED BETWEEN 59 AND 86 F (15 AND 30 C). |
| 9 | Medical Controlled Room Temperature Secured | MEDICAL CONTROLLED ROOM TEMPERATURE SECURED (INCLUDES CONTROLLED OR LIMITED ACCESS) ??? 68 F TO 77 F (20 C TO 25 C) (INCLUDES SCHEDULE III, IV, AND V DRUGS) EXCURSIONS ARE PERMITTED BETWEEN 59 AND 86 F (15 AND 30 C). |
| A | Heated General Purpose | HEATED GENERAL PURPOSE - HEATED 40 F AND ABOVE. |
| B | Unheated General Purpose | UNHEATED GENERAL PURPOSE. |
| C | Controlled Humidity | CONTROLLED HUMIDITY ??? 40 PERCENT - 50 PERCENT RELATIVE HUMIDITY (RH). |
| D | Controlled Room Temperature | CONTROLLED ROOM TEMPERATURE ??? 60 F TO 80 F (16 C TO 26 C). |
| E | Reserved | RESERVED. |
| F | Freeze | FREEZE ??? -4 F TO 1 F (-20 C TO -18 C). |
| G | Freeze | FREEZE ??? BELOW 32 F (BELOW 0 C). |
| H | Hazardous Material | HAZARDOUS MATERIAL. |
| J | Reserved | RESERVED. |
| K | Reserved | RESERVED. |
| L | Reserved | RESERVED. |
| M | Reserved | RESERVED. |
| N | Hazardous Material/refrigerated | HAZARDOUS MATERIAL/REFRIGERATED ??? 36 F TO 46 F (2 C TO 8 C) |
| P | Reserved | RESERVED. |
| Q | Reserved | RESERVED. |
| R | Refrigerated | REFRIGERATED (CHILL) ??? 32 F TO 50 F (0 C TO 10 C). |
| S | Shed | SHED ??? STRUCTURE WITHOUT COMPLETE SIDES OR END WALLS. |
| T | Secured | SECURED (INCLUDES CONTROLLED OR LIMITED ACCESS). |
| U | Uncovered Space | UNCOVERED SPACE (OPEN STORAGE). |
| V | Secured Vault | SECURED VAULT. |
| W | Wet Storage | WET STORAGE (DOCKS, PIERS). |
| X | None Assigned by Inventory Control Point | NONE ASSIGNED BY INVENTORY CONTROL POINT (ANY TYPE SPACE IS ACCEPTABLE). |
| Y | Ammunition | AMMUNITION (CLASS V; IGLOOS AND MAGAZINES). |
| Z | Special | SPECIAL (SEE THE ITEMS STORAGE SERVICEABILITY STANDARD OR TECHNICAL MANUAL). |
About TOS
What is TOS in FLIS / NSN cataloging?
TOS (Item Type Storage) iTEM TYPE STORAGE CODE: A ONE POSITION ALPHANUMERIC CODE THAT INDICATES THE TYPE OF STORAGE SPACE AND ENVIRONMENT CONDITIONS TO BE MAINTAINED FOR AN ITEM DURING STORAGE AND SHIPMENT. IN ACCORDANCE WITH DOD 4100.39-M, VOLUME 10, TABLE 182 AND DA PAM 708-2, TABLE 3-20.
What does TOS code 2 mean?
TOS code 2 means "Medical Controlled Humidity". MEDICAL CONTROLLED HUMIDITY ??? NOT TO EXCEED 40 PERCENT RELATIVE HUMIDITY.
How many TOS codes are there?
The U.S. Defense Logistics Agency defines 32 TOS (Item Type Storage) code values in the FLIS published code dictionary. Each is listed on this page with its official meaning.
Last updated 2026-05-26. Published by DAITK™ against the U.S. Defense Logistics Agency (DLA) FLIS code dictionary, governed by DoD 4100.39-M (Federal Logistics Information System Procedures Manual).
The authoritative FLIS code dictionary published by DAITK™ — every cataloging field and value code, defined verbatim against the U.S. Defense Logistics Agency (DLA) FLIS standard, governed by DoD 4100.39-M. Authorized reference data, reproduced with attribution, not scraped.
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