use a stuff sack or get some wide elastic and sew or knot some bands?
------------- Baby Milk Action is a non-profit organisation which aims to save lives and to end the avoidable suffering caused by inappropriate infant feeding.
http://www.babymilkaction.org/
I bought stuff sacks for my Astrals for just the same reason. One of the original bags for the Astrals is fabulous for carrying towels, other bedding, teatowels and the picnic rug though, and the other we use as the dirty washing bag.
------------- Baby Milk Action is a non-profit organisation which aims to save lives and to end the avoidable suffering caused by inappropriate infant feeding.
http://www.babymilkaction.org/