Great bag, but too big for hiking.
922573
This bag is definitely for car camping. You won't be compressing 40"x90" much. I feel like I could fit two people side by size or three people cuddling, but it is supposed to be for down to 0 Fahrenheit, so that probably won't be necessary. My chief complaint is that it is so heavy and thick, but I was aware of that when buying it so it is not that the product itself is faulty. I just wish the product was more slim so it would be suitable for carrying on a long hike, such as a thru-hike of the AT. Rolling it back up and stuffing it in the sack isn't the easiest of tasks, but it can be done if you are persistent. I will be trying this with both a hammock and a tent.

At nearly 9 pounds, this is a pretty heavy bag. It is too thick to fit in my Alps Mountaineering Caldera 5500. I will end up hanging this from my pack. Keep this in mind while you deliberate on purchasing it. I do not doubt its warmth and comfortability, but this is definitely not for long hikes.

I'm going to test this out for living in the wild for a few weeks and I will update my review then.
4535143
Very nice bag and can get a lot in it but as a female it was a little too big for me so I returned it for the reason of four stars. Otherwise, I would highly recommend it. Comes with a neck strap which I would have preferred it hook from one side to the other instead of just in the back of pack.  Comes with a very nice zipper enclosure to protect  your gear.
398004
I really wanted to keep this bag, but the sling strap at the top was just too wide for how I wanted to use it;  i.e. to just throw it over my right shoulder, like a back pack.  It's a great bag though--I even thought of altering the strap so I could keep it--but I'm just not talented in this regard!
886277
This is a nice little bag that is great for a day hike.  I often hike with my wife and 2 year old son, and we don't need too much.  Just a few snacks and water, making a backpack overkill.  This waist bag is large enough to fit everything we need.  There is a clip for the keys, so they are not dangling in your pockets (I've lost keys hiking before, this is a must for me now).  There are two compartments with a generous amount of space.  I have two criticisms, first the side mesh pockets are quite small.  I could not find a refillable water bottle that would fit.  It looks like it would fit a small disposable water bottle that you purchase from the store (banana in my photos for size reference), however, the main compartment is plenty large enough to accommodate my Nalgene water bottle.  Second, there is a ring for a shoulder strap that is in the way of where the mesh pockets are.  The bag is too small for use with a shoulder strap.  In fact, none of the stock images appear to have the shoulder strap attached.  You can see from my pictures the strap that is included.  I have removed the shoulder strap and do not plan on putting it back on, however, the rings are not removable.  You could perhaps hang stuff from them using a carabiner.  Overall, the build quality is good, and looks/functions much nicer than a standard waist pack.  The mesh allows air to flow past, keeping the pack as cool as possible.  The belt is thick and distributes the weight well.  The buckle is large and made of hard plastic.  Overall I am very satisfied with this product.  I was given this product in exchange for my honest, unbiased review, and this has not impacted my opinion of the product.  This is my new go-to bag for short hiking trips.
3024194
Great, sturdy bag...but it is ENORMOUS!  If you have spatial imagination issues, make sure you measure out just how big it is so you can visualize it before you buy it (the dimensions are on the site, so this isn't a complaint).  It would have been great if I needed to store a large Christmas tree!  Still, the bag is great if that's the size you're looking for.  I do use it for a lot of Christmas decorations now, but I wish I had figured out how big it was.  My bad.  The bag, again, is great, well made and...um...very spacious.
3530292
I really like this bag, it can hold a lot and the straps are really comfortable.  It is too big for my torso though.
4569381
Its great concept bag for hiking, where you could carry two bottles of drink in you camera bag. This is the bag I grab for vacation, hiking, street photography...etc. It's not bulky, but still fits 24-70mm f/2.8 comfortably (it won't fit if attached to camera), 50mm f/1.4, and 70-300mm f/3.5-5.6. Although it will barely fit 70-200mm f/2.8, but I would not commanded due to thin padding. I would give 5 stars easily as it's the most perfect size, but due to waist belt that is lame design (it looks like waist belt is sown in up side down). Basically the top part of the bag leans forward and bottom of the bag gets squashed. In my waist it feels retarded. I sometimes think that it might be manufactured wrong. Just for testing I carried the bag upside down and it fits nice on my waist. Every time I carry this bag, I complain and yet, I rather carry this one than slingshot or other bulkier bag.
1134358
This is a nice bag for an adult. I bought it because it said kids on it and I thought it would be good for my sons but it is much to big for them. I might actually use it for shorter hikes instead of the larger book bad I carry though. It is small and compact but the straps have lots of pockets.
4731205
I love the simple design and practicality of this product - and it looks and works great, except for the fact that it is far too big for my pack.  I ordered there medium, as my pack is 41 L.  If there were a smaller size I would exchange and give it 5 stars, but as it is, even though this is supposedly the right size for my pack, it flops around a bit even after I've cinched it as tight as I can with the drawstring.
1023815
4 stars because I do not believe this could be used as a hiking bag, unless you have a small breasts. My bosom is large, so when I try to wear it as a cross-body backpack, it wraps around one of my breasts in a very awkward way.  However, if you wear it as a normal purse, it hangs off the shoulder very comfortably.  It is designed to hang on your right shoulder, so if you like to wear your purses on your left shoulder, you may have a problem wearing this bag. I have decided to keep it because it is cute, well-made, and comfortable.

The bag is roomier than I thought, which is a good thing. The more you put in the front pouches, the less room there will be in the main pouch. In the front-most zippered pouch, it can fit my knife, chapstick, and maybe a couple more small items (it is not very deep). In the second zippered pouch, it can hold a standard sized wallet and there is still a little bit of room for something else. Sometimes I put my phone in this pouch and it fits fine with the wallet in there as well (I have a galaxyS6).  The top pouch holds my keys.  The main pouch can hold my ereader, a 750 mL camelbak water bottle, and sunglasses. Filled with all of this stuff, it is a little packed, but it doesn't look weird or hang awkwardly. If I did not want to carry my ereader, then I could fit in my 1 liter nalgene bottle and my sunglasses.  It can fit a 1.5 liter nalgene as the height of this bag is about the height of the water bottle. I would have to put this water bottle in the bag before putting any other items in the entire bag.

Overall, it is roomy, but only as a small purse. For traveling, I think this would be great. I can easily access my wallet without having to take the bag off of my shoulder. I like easy access to my things.  As a "hiking bag", you could probably only fit a liter nalgene bottle and a rain jacket that could be stuffed in there. If you are not concerned about unpredictable weather on your hike, then this would be good for a liter of water and some small snacks, a small bottle of sunscreen, sunglasses, and of course your wallet, phone and keys. The zipper pulls cling together as you walk and makes a "clingy" noise, but it isn't totally unbearable.
4614031
This is a well-made, well-designed, extremely functional and unusual bag. But. It was so large for me, by body just kind of disappeared behind it. I'm 5'5" 130 lb female. If a smaller version comes along, I'll jump on it! :)
4168233
I bought this for my daughter for her hike on the Camino de Santiago.  It served its purpose and she liked it but it didn't sit well on her hips. (she's about 5'10 with long legs and shortish torso) I think it's probably more suitable for a one or two day hike.

7/26/17:  I do want want to clarify that I'd give this bag 4.5 stars if I could because of how durable the bag is. My daughter hiked 15 miles per day for 3 weeks and the bag held up through the kinds of "abuse" only afforded to long-distance hiking.  It really is a great bag. Maybe a lightweight internal frame and memory foam in the shoulder and hip straps would help with the "fit" and comfort.
411287
great quality stuff-able backpack for small outings.
would've given 5-star if it wasn't so small.
it's like a little bigger than a toddler's backpack size.
( I know they make a larger size, but the larger one has way too many buckles and makes it look like it's meant for hiking rather than a day-pack).
4210917
It's an awesome bag for traveling and it's a really good bag even for hiking, camping etc. Just wish it could be a little bigger, both outside and the inside slot for the laptop, the laptop slot can't be closed if have a laptop sleeve on. Or maybe I'm asking for too much.
956419
Great bag at the price for day hiking or if you lug a ton of gear. I ordered one due to the Wirecutter review, and can see why he liked it.

I returned it, however. More bag than I needed for cycling to work and going to the gym. I got a 20 liter Deuter instead, which is perfect.
2057554
This bag was amazing. Unfortunalty I had to return it. It was huge! It will work for a larger person but I'm very petite and I'm sure they would have asked me to check this bag at some point on my travels. It's longer than my torso and I'm about 5 5 . 120lbs.  But it really was awesome lots of space lots of compartments I wish it was a tad smaller.
289433
Very nice bag only problem for me was it was too big. Really wish they'd make this bag in a different size.