Our drawstring bags are completely interfaced, so they stand up on their own, but are still squishy enough to shove in a larger bag.   All bags are 2 layers of fabric and interfacing.  Hidden seams.  Drawstring closes tightly so that if you put your bag in another bag upside down or if it falls, your yarn will not escape.  When the drawstring is closed, they act as handles.  A reinforced tab to hand keys, stitch markers etc.  All our bags have coordinating fabric inside and out and the drawstring channel tabs.