an Alpacka makes a very sweet pillow. they come of course with a stuff bag and an inflato bag, and that won't do.
you can make a smaller (and Much nicer) stuff sack on yer own. and the inflato bag, although generously huge, is heavy to do just inflation only.
an idea might be to make a dual-use stuff sack the correct length, but quite a bit wider (for inflate volume). then you can roll/fold the raft, insert it into the bag, fold the bag over the final roll, and strap it tight. this will give a small, tight, squared away bundle (a good pillow). when water time happens, the bag (which has a convenient hole) is used to inflate. there is no need for the GIgantic inflato bag they come with for just to odd filling up. many folks carry a lashing strap anyway for tump lines and such, so around an Alpacka raft is a fine place to store it.
one in no way needs the rods they put in the stock inflate bags.
your custom bag will easily inflate to max with just a "poof" of breath, and then hold the air (mostly) with a quick twist of it's top.
granted, Sheri's bag fills the boats in 1/2 the time. yes. it works fantastic. but it's extra mass for a small gain. a smaller bag will fill a raft in let us say, twice the time, but it's twice of not-very-long, so the savings is kind'a moot.
"will it being rolled tight muck it up ? "
a surprise, it seems not to (too?)(never that sure..). if you kept it rolled weeks on end at home, month in and out, yeah, it would crease it and hurt the fabric i bet. for several months a year i keep mine rolled, using it on occasion, and only the floor shows a crease. that said, the new raft came with a crease on the floor too, and it was about a few hours old only.
no worrying, it's vastly tougher than it looks.