Sandbags
From Command and Conquer Wiki
Sandbags were a light, inexpensive, defensive barrier used to hold back infantry and light vehicles. It was used by the Allies in GWWII and both GDI and Nod in the First Tiberium War. It also served a variety of civilian purposes.
Apart from barbed wire fences, sandbags were about as weak a defense as could be imagined. Any sort of explosive weapon, including grenades, tank shells, rockets, all manners of missiles, and artillery could eliminate a pile of sandbags with ease. However, this was counterbalanced by the sandbag's trivial expense - a base could be ringed in sandbags for half the price it would take to put in sturdy concrete walls. However, it should also be noted that Sandbags could not block tank ordinance, so it was still a very weak defense.
Ironically, at times such a 'weakness' would turn out to be a strength. Sandbags could be used to keep troops and civilians from entering areas that they were not supposed to go to, whether because of traffic concerns (such as taking poorly-planned routes to resources) or of hazards (Tiberium fields). Sandbags continue to be an important element of the arsenals, as they are a cheap, but effective bullet stopping defence, used to surround GDI foxholes, for example.
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