What Is a Mobile Storage Unit (MSU)? Specs, Capacity and When to Deploy

A mobile storage unit (MSU) is a rapid-deploy, tunnel-shaped temporary warehouse used to store relief stock where no fixed building exists. The standard humanitarian MSU measures 24 by 10 by 5 metres, giving 240 m2 of floor area and roughly 840 m3 of usable volume, and a trained crew can erect one in a matter of days rather than weeks.

What are the standard MSU specifications?

The MSU that most UN and NGO operations standardise on is a single, repeatable size. It is 24 m long, 10 m wide and 5 m to the ridge, which yields a 240 m2 footprint and about 840 m3 of internal volume, the size WFP and the Logistics Cluster procure and donate to responses, per the Logistics Cluster (2024). The structure is a galvanised steel or aluminium frame clad in a heavy technical PVC membrane, anchored to the ground rather than poured into permanent foundations.

That fixed geometry is a feature, not a limitation. Because every unit is the same, pallets, racking plans and door positions are interchangeable, spares fit any unit in the fleet, and a logistician who has built one MSU can supervise the next without retraining the crew.

How much can an MSU hold?

Plan capacity off the floor area, not the headline volume. Of the 240 m2, usable stacking area is lower once you allow for aisles, a goods-in and goods-out lane and a safe stacking height, so a single MSU realistically holds several hundred pallet positions of food, shelter NFIs or WASH consumables. For high, light cargo such as plastic jerrycans or blankets you approach the full 840 m3; for dense cargo such as canned food or chlorine you will hit a floor-loading limit long before you run out of air.

A practical sizing rule: one MSU covers a small field operation or a forward dispatch point, and units are simply added side by side to build a larger hub. This modularity is why MSUs, not permanent sheds, are the default first build on a new UN agency and NGO response.

When should you deploy an MSU instead of a permanent warehouse?

Deploy an MSU when speed, uncertainty or access rule out a permanent build. The clearest triggers are:

• A sudden-onset emergency where stock is arriving and has nowhere safe to sit. Pre-positioned relief items held in the UNHRD network can be dispatched within 48 hours of a partner request, per WFP, and that cargo needs covered storage on the ground at the same speed.

• A short or uncertain operating horizon. If the operation may last months rather than a decade, a structure you can erect, dismantle and redeploy beats a fixed asset you cannot move.

• Hard last-mile access. In a country such as South Sudan, which has roughly 20,000 km of road of which only about 400 km are paved and where most rural roads are impassable in the rainy season, per WFP, a structure that ships in components and is built on site is often the only structure that arrives at all.

Choose a permanent or semi-permanent warehouse instead when the operation is clearly multi-year, the site is secure and accessible year-round, and the lower running cost of a fixed building outweighs the flexibility you give up. For most new field hubs, the MSU is the right first move, and a heavier structure follows once the operation proves it will stay.

Frequently asked questions

What size is a standard humanitarian mobile storage unit?

The standard MSU is 24 by 10 by 5 metres, with a 240 m2 floor area and about 840 m3 of internal volume, per the Logistics Cluster (2024).

How long does it take to erect an MSU?

A trained crew with the right site preparation can erect a standard MSU in a matter of days, which is why it is the default rapid-deploy storage for a sudden-onset response that needs covered space fast, as reflected in WFP and Logistics Cluster MSU deployments.

How much stock can one MSU store?

Working off the 240 m2 floor and a safe stacking height, a single MSU holds several hundred pallet positions; dense cargo is limited by floor loading, while light, bulky cargo approaches the full 840 m3.

When should I use an MSU instead of a permanent warehouse?

Use an MSU for sudden-onset emergencies, short or uncertain operating horizons, and sites with hard seasonal access, such as South Sudan, where only about 400 km of 20,000 km of road is paved, per WFP.

Specialized Logistics Solutions is an in-country distributor based in Juba, an authorised regional distributor for Hallgruppen structures, Aquatabs (Medentech/Kersia), P&G Purifier of Water, Oxfam tanks and bladders (Butyl Products), and Multiquip and Aussie Pumps, and a UNGM-registered vendor (No. 380716). In the South Sudan cholera response SLS ran the full chain behind the stock, handling procurement, customs clearance, Juba warehousing and last-mile delivery to reach 27,344 households in Juba and Renk, so MSU supply comes with the people who clear, store and erect it, not just a structure shipped to a port. Request a quotation from SLS to size and deploy your storage.