Great hydration pack for hiking
352099
I bought this pack to hike Long's Peak, and couldn't have been happier with it.  The built in rain-cover came in super handy on that hike.  I'm a rock climber and mountain biker, so I also really like the helmet lock strap.

I'm 5'10 and 155 lbs, with a thin build, and I personally liked the M/L size of this better than the S/M, although your mileage may vary.  I suggest trying both.  I only wish they made a medium specific pack.
4846692
This is a great pack if you plan on running or biking or hiking long distances with your backpack. I bought a 2 Liter Camelbak bladder to put in it and it works out great. I currently have a 30D (looking to upgrade to 60D) with NO grip on it. I have the 17-50 Tamron NON-VC lens connected to it. In the camera part (the bottom part) I have the camera with the lens on it with some filters and a shutter remote. I can probably fit my backup lens (28-135) in there but I hardly use it so I haven't even tried it yet. The camera is pretty tight but it makes it so there is no room for knocking around which I like. The top large pocket is big enough for snack and a small, light jacket. It also has 2 small front pockets, one protected by a zipper and one with just a simple strap. It also has a small top pocket that is protected by a zipper that can fit 2 iphones, my wallet, and a small set of keys comfortably. It has a strap for a tripod which works well. The rain sleeve that is built in works well (actually had to use it today since I'm living in Hawaii) and is easy to retrieve. Let me know for more questions.
1804767
Just got the pack, have had this same model before but in orange but I like the lime green it is very uplifting and fits in well with the kind of hiking
I prefer to do, spontaneous.

Pros- light weight, nice compartments, hydration sleeve, has reflective zones, shoulder straps nice and wide, sternum strap adjustable.

Cons - None so far
846820
For the price this pack is amazing! I have had this for a while and use this pack every time i go camping. What makes this pack work for me is that it has a bunch of pockets and a pocket for your hydration pack.
3502698
Used it on several hikes and it works great. Lots of storage in many different pockets. It is easier to put the water bladder in before you load up the pack.
3544251
Just what I was looking for, I have used this for hiking, skiing and going to festivals. Very comfortable pack with lots of pockets for organization. Keeps me hydrated, nuff said.
7228
I needed a sturdy water pack for daily hiking trips. Since I carry all of my equipment in a vest, I had no need for a backpack and I didn't want to carry a water bottle around. This thing carries about 2 litres which, for a simple day hiking or a quick run, is more than enough. I've yet to run out and that's with me basically keeping the tube between my lips and having a drink every minute or so. Both of the straps adjust perfectly and running or climbing hills it doesn't bounce at all.

The bladder has a big opening to fill. It's big enough that I fill about half of it with water and the other half with ice cubes so I have cold water all day long. The mesh on the back is big enough to carry either a book should I want to stop and read for a while or my first-aid kit if I don't feel like shoving it in my vest.

It would be easy to pay $40+ for a Columbia or other well-known brand of hydration backpacks which carry the exact same amount or less. This is really quite the bargain. My only complaint is that I wish it was a tiny bit thicker so I could carry even a few more things in the net part on the back.
1528963
This is a really light weight pack. Plenty of room for a 3 to 4 day backpacking trip. Extra gear if necessary can be clipped to exterior straps etc. There's a nice internal compartment to have hydration bag. Velcro strap keeps hydration bag in place.
4614065
Works well for my 10 year old.  I use the 100oz hydration pack.  It fits snug to the back and is ideal for hiking, rock hopping, and biking.  Amazon has the best price I have been able to find.
4433862
This is a great hydration pack.  It was exactly what i was looking for for long shed hunting trips (long hikes looking for antlers) and my upcoming trip to Wyoming.  I chose this one for the additional zippered pockets and compartments to keep other essential items on me while still forcing myself to keep it light and only bring necessary items.  With a normal backpack I tend to throw in a bunch of useless stuff just because I have room.  The snap strap on the back is great for strapping down my coat when it warms up.  The back padding keeps it off your back making it cool and comfortable. The chest and waist straps are also a must for keeping it comfortably in place.  The bladder has a rubber taste as to be expected for the first couple of uses.  I minimized that "rubbery" taste by washing it 4 times prior to my trip, along with one bleach treatment.  Overall, it's a great little hydration pack for those that need some extra storage.
304788
This was a great find for a day hiking pack.  Excellent size for your ten essentials, big water bottle, lunch, and a light sweatshirt.  I love that it can expand and contract, which makes for more versatility and comfort.  Lots of little pockets.  The extra mesh helmet/shoe net is a nice feature that does not get in your way when you're not using it.  Very comfortable shoulder straps and adjustable chest strap with built-in whistle on the buckle.  The hip belt tucks away if you don't want to use it.  An excellent value.
1112950
I like this because it has a shoulder strap to  prevent it from sliding down on my butt during hiking, thats the problem with my other one that doesnt have a shoulders strap. I can carry my dry food,portable stove,fire starter,first aid kit & a small water bottles on the side. I just wish the water bottle pockets were bigger other then that Im happy. Last week I use this pack during a rainy day and Im surprised how well it kept all my stuff inside the pack nicely dry. Very happy,
833529
This pack has been solid for the past year or so and has become a staple whenever I go on a day hike. Ample room in the main pocket allows for a small lunch for two, side pockets for two water bottles, and a padded pocket for my cell phone and wallet! Grab one! Well done!
2277142
needed a pack for day hikes and this is perfect! i can fit two extra layers (nike quarter zip and columbia rain jacket), food/snacks, portable chargers and all my camera accessories! I love having the water pack too, i filled it with ice and cold water in the morning and it was still cool by the end of the day!
3224943
Great hydration pack, I use it for mountain biking and it has just all the pockets and elastic holders I need for my multi purpose tool, air compression pump, key clip to keep your keys in place, tire patch kit, mini sealant bottle and many more pockets to hold your items in place.  It also has one large pocket for your hydration pack for easy removal, a second large pocket to hold any large items and to side pockets to hold tissue or additional water bottles. This pack is just the right size for use on trails longer than 20 miles.
1111615
Let me just say that before I got the H.A.W.G. model, I owned a&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/CamelBak-Men-s-Lobo-3-Liter-Hydration-Pack/dp/B000IF8DTW/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">CamelBak Men's Lobo 3-Liter Hydration Pack</a>, which, as you compare and read the reasons listed below, I was very happy to upgrade from.

There are a total of seven (7) compartments on this pack:

1) The back one, contains and seals the hydration pack.
2) The main large one, which I have stuffed in two 26inch slime tubes, a handheld pump, a shock pump, an extra chain, a first aid kit, and all my cellphone/wallet/key necessities. Before riding, it also fits my sunglasses, gloves, protective pads (elbow, shin).  PLENTY of room left.
3) Two side pockets with zipper.  I honestly cannot find a use for these, but they are there.  I guess I could pack snacks or gel for the 20+ mile rides, but for now, I am thinking they could serve as a quick access points for camera, GPS, or trail maps.
4) A front zipped pocket.  This serves as my tool shed.  Bike tools, wrenches, extra chain links, tire levers, all goes in here.
5) A meshed quick access front pocket, with a locking strap.  I don't necessarily like anything in here (just so it doesn't fly out on those tech terrains).  Again, more room if I need it.
6) An MP3 player pocket.  I don't necessarily listen to music when I ride, but this easily fits an iPhone.

The camelbak holds up to 3 liters (100 ounces) of your favorite fluid, with its tube easily routed to your favorite side.  It is very easy to take the hydration pack out.  Unzip the back pocket, disconnect and remove the tubing, and you can remove and replace or clean the entire pack.  So far it's been very durable and well protected.  My advice is to have the pack facing inwards where the tube comes out, as to not having it press against your back!

I honestly cannot see any weaknesses.  I am a big guy and this things straps on to me and holds tight even on the most technical terrain.  A bit pricey maybe, but I did find it on sale for 56$ at my local bike shop.  However, I would have happily paid the full MSRP for this (around $100 I think).  You will not be disappointed.
2061564
Great small bladder backpack for day hikes. By the time the bladder is full there is enough room for a lunch, sweatshirt and a few snacks. Perfect for kids or as an adult day pack. Hiked around Yellowstone with my ten year old for 5-6 miles every day and he was the one that wore it, he got close to emptying the bladder most days and stayed hydrated the whole time.