Many stores only offer LME in fixed quantities of 3.3 lbs or 6 lbs. Since it's impractical to use only part of a can/jug of LME, DME is frequently used to make up the difference in fermentables between what a can or two of LME provide, and what a style calls for. DME is most commonly sold in 3-lb bags, but if you re-seal them properly, the remainder can be stored for several months.I'm new to brewing and wondering what, if any, disadvantages are there to using dried malt extract versus liquid. I noticed many recipes call for both. Why is this?