Very light in weight Suitable size where you can carry ...
937623
Very light in weight
Suitable size where you can carry with you and fits anywhere
3319022
very compact and lightweight. not for very cold weather obviously but perfect if you are trying to keep the weight down on your gear.
2703776
Small but very light yet sturdy construction.
2372578
Light weight. Maybe good for school packing or day time hike but not likely to handle heavy loads over a long period of time. For short hauls and trips I would prefer to use this back pack than the heavy duty style.
3320789
Pros: Surprisingly very light weight and so easy to store in my closet that is very full of stuff because it folds to a small pouch. We have used for day hike and another time for camping and it held up well. We filled it with clothes, snacks and 2 water bottles - noting too heavy, and it was fine. It would be great for when we travel as an extra bag in case the luggage gets overweight or we do too much shopping and have to fly it all back. Perfect for 11 year old because most of the weight is the stuff being carried in the bag and not the bag itself. Looks good too. :-)

Cons: I think if you plan to fill it with very heavy things, you would need a bag with a waist band so the weight does not hang on your shoulders only. This one does not have a waist band to support the weight...but for the purpose we are using it for, its working fine.
3413196
this was a gift but it is very light weight and looks handy
3733387
Just the right size for me to carry with me as I pick up the magnolia leaves that fall this time of year in my backyard.  It is lightweight but doesn't collapse easily like other bags do.  The handles make it easy to slide one over my arm and have two hands free for the pick up.  A good value for the money also.
669484
I have all ways liked the ease that you can fit this in to any bag /pack/car space that you need. Light weight and very durable you can;t go wrong with a couple of these.
3603623
This bag is perfect if you are looking to do a day hike. It folds inside its own pouch which can fit in my palm and when opened up, its a small yet spacious bag. I fit in couple of bottles of water, snacks and some electronic devices. This bag does not have any padding which makes it so light weight. After your done consuming the stuff in the bag you won't feel any weight on your way back.
Note: Since this bag does not have padding, the items  in the bag might poke your back but it didn't bother me.
4010934
Light and durable (for what it is). If you are looking for a light-weight, easy to pack backpack that can hold a few things (water, sweatshirt, mosquito spray) for am occasionally hike, this works. Certainly would not be an everyday backpack and likely would not do well over-packed. But I love it for what we use it for.
1943700
I bought this backback for walking around in the city on a recent trip.  It's very light but has plenty of space for small things like books, laptops and the like.  It's a great little pack for short trips.  The weight was important to me as I didn't want to carry around something big and bulky, but this is perfect.

It has two main compartments, one with a clip-in section for laptops and some slots for pens/pencils and other small items.  The other has a zipper pouch.  There are two side compartments for carrying other small things like cell phones, pill boxes, gum and the like.
4770800
Light enough to carry if one is a member of a sewing circle for charity work.-0
2746577
Inexpensive, light and carrying bag, overall a great deal!
2148804
This bivvey is light weight and compact, very nice but can use anther 4" to 6" inches  of feet room all in all very nice.
4245774
Needed smaller one for shorter hikes and to minimize extra weight to be carried. This fits the bill in size and with light materials.
3427324
Love it - light weight and easy to carry. Doesnt hold a ton of other stuff, but I didn't need it to.
1332556
Light weight, perfect for traveling in the spring.