Stacey, I invested in a grommet-setter and a bag of grommets -- less than $10 at the hardware store, including about a year's worth of grommets. Put a metal grommet in each corner of the sack, cut an appropriate length (varies by cage size) of flexible light-weight nylon rope for each corner, thread it through the grommet and tie the ends securely. Both the grommets and the nylon rope survive the washer and dryer with no problems. For hardware, I hang a metal shower-curtain hook (also cheap!) in each corner of the cage; they're big enough that it's easy to slip the rope loops on and off the hooks without having to climb into the cage. I used to use s-hooks, but since I'm not very coordinated I was forever knocking them off the cage trying to install or remove the sleep sacks; for the aim-challenged, shower curtain hooks (big pear-shaped things) are much less frustrating. What a good Friend of Ferrets you are! Have fun with your project. ellen & the Gang of Three [log in to unmask] [Posted in FML issue 2221]