These are great! I got the glare free ones. they are the slightly frosted, so look at my photos. its clear to look through but you dont get the shine that can sometimes obscure the image inside the sleeve.
now, I use these in my work room, in my recipe book....
ok, they are a heavy duty for a sleeve protector. any thicker and it would not serve its purpose as a sleeve protector.
there is a space in the upper corner by the tab holes, this is where you can get the sleeve open, its super easy! see my photos. this may be thicker than you need for a kids school assignment but its great for a long term, going to be used all the time, paperwork your planning on keeping around. they have 3 holes and fit a standard 3 ring binder nice and easy.
once you put the paper in, you will find that a standard printer paper size sheet fits in here easy, with out a struggle, and there is about 2mm on the side left over, so you can put in heavy paper and back to back papers and not rip the sides out. its also very easy to just wipe up spills on it if you use it for recipes in the kitchen and cook while its out.