The link isn't work for some reason, and I am curious as to which backpack this is. This is the only $9.99 I could find, which is the Preschool one.
http://www.landsend.com/pp/BoysPres...sku_0=::COB&CM_MERCH=SRCH_00001&origin=search
The one I looked at yesterday is gone today. Probably sold out. Here's
another Junior that's only $12 (Lake Blue only).
According to the dimensions it looks like the Preschool one and Junior one are pretty much the same size
...
Can a child, say about 3-4 years old, easily slide a standard fold inside of the bag?
Our current Deuter backpack isn't working well with C according to his teacher, because the opening isn't quite big enough for him to manage putting his folder in there by himself. We are backpack hunting again.
I haven't seen the Preschool one in person, but I know the one I clicked on yesterday had a smaller volume listed than the Junior I clicked on. The Preschool one on clearance right now doesn't list volume, and the dimensions listed are the same, so...
Classic ClassMate® Backpack - 1345 cu. in.
Classic ClassMate® Junior Backpack - 1115 cu. in.
Preschool from memory - 10xx? cu. in.
You could always order both, and return the one you don't like (you can return LE orders to Sears).
I couldn't find a standard pocket folder, but I did pull out a 3-ring binder and a manila folder, and Kira (19 mo) was able to put both of those into the Junior pack, so I don't think a 4 year old would struggle at all. It unzips quite far (not quite flat, but nice and wide).