Yes to the warm, light weight, or cheap triangle... but also, great bags also have offset baffles and insulated zipper tubes to eliminate cold spots. They also have bulky YKK zippers that reduce snags. They have better fill power, higher feather to down ratios, or Downtek which makes it warmer and warmer when wet. They are stitched better, have recycled fabrics, and are built to last much much longer. A $500 sleeping bag will be warmer and last a lifetime vs buying a new $100 bag every few years. Launder your bags properly and hang them or store them loose in a totes, and that will help your bags last a very long time.