Cement is commonly sold at building material dealers in 25 kg bags or in bulk by weight.

There are several types on the market marked by a number ("325" - "425" - "525") which indicates the resistance in Kg/cm² after 28 days.

The most widespread is 325. Cement bags have an internal protection against humidity but it is however a good rule to keep them in a dry place, possibly not on the ground but on a pallet.