|I have 2 WAHMies pail liners in rotation. They have the elastic top and the fabric is laminated on one side. The way they designed it, there's a tag of fabric in the seam for putting essential oils on for odor control. To use it this way, the fabric side has to be against the diapers and the PUL is away from the diapers [facing the pail]. Wouldn't you know, the first week I used it that way, I got mold spots in the fabric at the bottom of the bag [both bags, so the dipes were only in there 3 days byt he time I washed them!]. The spots didn't wash or sun out. From then on, I used the PUL side against the diapers because it's slick and no moisture [or ickies] sticks to it. It's been a year and I haven't had any more mold spots. It doesn't bother me that the shiny PUL is visible when it's folded over the top of the trashcan because the lid overlaps most of it anyway [home logic touch top, flip top trashcan from kmart for 15 bucks]. I haven't had a need for the essential oil patch either and we wash twice a week.
I think there's a new version of the Whamies [and other brands] that has an elastic loop in the seam for wrapping around the top of the bag to keep it closed during transport. However all pictures i've seen of that model show the PUL side facing out, which means the fabric side touches the icky dipes. To me, that's backward. errr... inside out. When we take the bag to the laundry, we lift out of the pail, hold it closed with one fist, walk it to the machine, and put the dipes in immediately, so that little elastic tie would be of no use to us anyway.
BTW, we use 2 pail liners because we put through the wash with each load [not the prerinse, just the wash cycle and spin, same with our covers] then we air dry them.