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terribletortoise , 3 hours ago A flat overhand bend in the elastic cord is what I recommend: www.animatedknots.com/flat-overhand-bend-knot Justification: Simple, not bulky, reasonably secure against shaking loose, and relatively easy to untie. As suggested in another comment, a double figure eight could be used as well. It will be more bulky and a bit less likely to come loose.
A flat overhand bend in the elastic cord is what I recommend: www.animatedknots.com/flat-overhand-bend-knot
Justification: Simple, not bulky, reasonably secure against shaking loose, and relatively easy to untie.
As suggested in another comment, a double figure eight could be used as well. It will be more bulky and a bit less likely to come loose.