перевожу постер по ТБ при работах на высоте. Запинка в следующем абзаце:
Containment can prevent materials falling whilst carrying or when storing on work at height equipment ready for use when required.

Скорее всего речь идет о средствах удерживания (не уверен, что есть такой термин) против падения материалов при,.. затем никак.

Помогите, плиз.

но если нужно со "средствами", то, имхо, тогда уж средства размещения или содержания
ибо to contain - это по моему разумению, все-таки, по-английски не удерживать (to secure), содержать внутри чего-то/хранить

Below is an example list of some of the methods of containing dropped objects:

Lower the working platform to the ground/perform all work on a structure at ground level and then lift it into position once complete rather than taking the tools and equipment to height.
Kickboards and handrails should be fixed on scaffolding, platforms and walkways. By using additional closed mesh solutions, plywoods or other solid surface materials, coverage can be provided for all the gaps through which items can potentially fall.
Utilise safety mesh or rated barrier netting (with debris lining) in areas outside walkways and underneath conveyors, walkway platforms and along building/structure perimeters to prevent the drop of materials to a lower level.
Utilise tool lanyards, tool cinches, tool pouches, tethering devices, holsters, tool buckets and other drop containment devices to secure tools and other items during work at height activities.
Provide worker with education on the risks and outcomes of dropped objects and provide them with the means by which they can minimise that risk.

http://www.safetysolutions.net.au/content/height/article/stop-the-drops-658165180