Plastic bags for rubbish or litter are sold in a number of sizes at many stores in packets or rolls of a few tens of bags. Wire twist ties are sometimes supplied for closing the bag once full. Varying thicknesses are commonly manufactured - thicker bags are used for heavy-duty applications such as construction waste, or in order to be able to withstand being compacted during recycling processes. In the mid-1990s bin bags with drawstrings for closure were introduced. Some bags have handles that may be tied or holes through which the neck of the bag can be pulled. Most commonly, the plastic used to make bin bags is the rather soft and flexible LDPE (low-density polyethylene) or, for strength, LLDPE (linear low-density polyethylene) or HDPE (high-density polyethylene) are sometimes used.
