[Zipper] I took this with me backpacking through Switzerland and Greece! It was absolutely perfect. I love how the zipper opens the middle compartment similar to a suitcase. This feature makes it so much easier to get your belongings out. It prevents digging through everything to find what you are looking for. I picked the 40L since we were only backpacking a week at a time. The size was perfect for me. I am 5'3 and even filled to the max this backpack was not too heavy or big for me. I was able to use this as a carry on with no issue on 4 flights (each a different airline). Oh and the green is awesome! I highly recommend this product!!

[Yes] Used this backpack for about a month in Europe. Liked being able to keep the big back at the hotel and use the little one throughout the day.

[Zipper] I have never owned a 15L pack but wanted to try one for hikes where I didn't need to take much with me. It was so nice to find a pack that feels sturdy with great useful features, but isn't over engineered. I was skeptical that this would be too small but I am really happy with how it has worked out. It is a great trail companion, or personal carry on while flying. I can even drape a rain coat over top, as you would climbing rope, and cinch it down with the two side straps if I want. The side water bottle sleeves fit a Nalgene bottle. I am most happy with how wide it opens up. Some bucket style lids just don't open up enough, this one allows you to see everything comfortably and access it with ease. I will say that the narrower tapering of the pack isn't the best for fitting a laptop. I would suggest the size up (25L) if you are looking for something to use more for that intention. If you are looking for a bag that has great versatile function, is comfortable to carry, made from quality material, and fits your essentials, this is a great choice.

[Zipper] I just got back from 9 days in Thailand and needed a bag that would hold everything PLUS be carry on approved. This bag held everything down tight and I had my laptop inside the computer compartment. Loved all the extras you don't notice until you get the bag. Security features are awesome and I wonder who thought of them because they rock. This bag is has super clean lines when everything is cinched down and made it super easy putting in overhead plane bins, bus bins, on ferry's and carrying on my back when riding a moped. The ability to hide the waist straps is really good. When traveling I saw so many other travelers with waist straps that just hang free. Why is this an issue? When stopping at bathrooms, for example, they put their bags on the floor and the straps are resting on really gross bathroom floors; in Thailand some of the toilets are just holes in the floor and a bucket of water to "flush." My bag straps where neatly tucked away. The top hard case is such an amazing feature and the hidden water bottle compartment. My girlfriend had a similar Northface bag and she keeps bugging me to buy her one of these. Only thing I would change is something I read in another persons review; I'd change the orientation of the top hard safety compartment's zipper. When the bag is laying flat, say on a bed, and the straps for the bag are on the bottom side, if one opens the hard case anything loose will fall out. It's not a big issue at all though. I also bought travel cubes and that made a huge difference. Twice I was stopped by TSA and they searched my bag; travel cubes made it SO easy to put everything back and get on my way!

Long story short, do not hesitate to purchase this bag! I never leave reviews but felt this bag deserved it.

[Zipper] The best backpack I've ever got !!!! And I have to say, Thule makes the most reliable products in the world. Keep it up guys, I'm 100% + satisfied !!!

[Zipper] My wife and I both have the Thule AllTrail 25L Bag. Zero complaints. Love the style, size, pockets. Perfect bag for day hiking. Here's a photo of our bags at the top of Quandary Peak.

[Black] Purchased this day hike bag to replace my backpack with no regrets. It got me down to Dripping Springs in the Grand Canyon and back. Light weight and easy fitting. Light weight but still rugged. I love it. Other hikers commented on it too.

[Yes] Perfect in every way as expected from such a great brand

[Zipper] I took this pack hiking every day in Glacier Montana in July. I carried 3L of water in a bladder, towel, raincoat, lunch, first aid kit, and fishing gear. This pack held up just fine in the heat, dust, rain, and hail. The quick access side pocket was convenient. My only complaint is the bottle pockets do not fit larger containers, nalgene size.

[Zipper] I bought Nanum to wear during the upcoming ski season. On a whim I used it as my personal item on a flight for an overnight trip. I could not believe how much I was able to pack in and still remain a comfortable carry! I own a larger 20L Thule backpack that I was very happy with. The Nanum was smaller and lighter but still allowed for many items. The rigid back frame kept the bag off my back and allowed for air to circulate. The smaller top pocket had just enough spaces to organize smaller items but didn't waste space with mutiple, limited functionality pockets found on larger packs. A bonus was the removable waiststrap. Thanks Thule!