Temporary storage buildings can accommodate a broad range of commercial goods, subject to the specification and any regulatory requirements.
Common uses include palletised stock, packaging, raw materials, finished goods, machinery, plant, vehicles, archives and seasonal equipment. Access, security, insulation and ventilation are selected around the contents and handling method.
The exceptions divide into two groups. The first is anything with a specific regulatory regime: hazardous substances, flammables, chemicals subject to COSHH or DSEAR, and food or pharmaceutical stock under a formal quality standard. None of these are automatically excluded, but each brings its own requirements for ventilation, bunding, fire separation or documentation, and those have to be designed in rather than added later.
The second is anything with a tight temperature or humidity tolerance. Standard cladding is weatherproof rather than climate controlled, so ambient conditions inside broadly track ambient conditions outside unless the building is specified otherwise.
Tell us what is going in when you enquire, not after. It changes the cladding, the ventilation and sometimes the layout.