It is and does what it is supposed to be and do.
I like how the SACK has two size settings, so to speak: One for when you don't want to bother rolling the sleeping bag up extra tightly and one for when you do. You can actually make it pretty small, and we take it backpacking, though it's probably too big for people who are more hardcore about backpacking and weight.
The little HOOKS on the sides do aid you in folding it up (though, if you're skilled enough, you don't need to use them).
The STRINGS for tying it before stuffing it into the sack are (as with all sleeping bags that are going to go into a bag/case anyway), useless, and using them actually makes it harder to load the sleeping bag into its bag/case.
The ZIPPER works fine and we have had no trouble with it, even with extensive use (every time we use it, we fully unzip it to use it as a blanket on top of another fully unzipped sleeping bag "mattress", and we are also easily able to zip it onto another sleeping bag when we want to).
If it suits your needs in terms of temperature, go for it!
Addendums:
1. Reading the other reviews complaining about the fabric inside… I agree, it's slightly uncomfortable (catches on rough fingernails, etc.). I'd take away a half star, if I could, but not a whole star.
2. I don't have trouble making it fit into the sack, even using the "smaller setting" (i.e., with the zipper on the sack zipped up.) I'm not trying to be mean but, really, I think the people complaining about that just aren't that good at rolling up sleeping bags. It's not easy to get it in the tighter way but it's VERY easy to get it in the regular way, and wholly possible to get it in the tighter way, too. I do it every single time, and often without assistance (though having two people involved makes it easier). An important hint: If you want to get it into the sack and have the sack zipped, too (making it smaller), it needs to be zipped BEFORE you put the sleeping bag in. (You will not be able to zip it afterwards!) So the tricky part is holding the zipper up so that it doesn't unzip itself as you stuff the sleeping bag in. Just roll it up tight and keep it tight while you pull the sack around it. It works best if one person's duty is just to keep the sleeping bag condensed and hold the zipper of the sack in place while the other person pulls the sack around the sleeping bag. It CAN be done! 🙂
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