I bought a kids 30-degree Marmot synthetic bag on sale and am going to simply cut off the bottom foot of the bag and re-sew the foot section. The bag was cheap enough ($40) that if it is outgrown in 2-3 years its OK. There is a little brother who then could use it. I picked this bag because it was the lightest and the narrowest. Sorry but I cannot remember the name of the bag. I am traveling so not at home to look at the box! PS. We got caught in the Arizona storm- trying to get to Albequeraue NM - had to drop all the way to Hw10 through Tuscon. Light snow and heavy wind nearly all the way to Truth or Consequences where we are now happily indoors.