for the bookbag I made I took one of those brown paper shopping bags and used the big square parts for the basic shape, I just cut the corners off the top and made it kind of u shaped I did that with both sides. (of the bag). then I measured around it to see how long the part with the zipper would have to be and you can just use a newspaper for that part of the pattern. I made mine about 5 inches wide. and of course there's the bottom part which was also 5 inches wide and the length of the bottom of the ushaped thing. plus enough for seams of you're really that picky. then I made i rectangle for a little pouch and made little rectangles that were the length of the little pouch and about 3 inches wide (I made 4, 2 were the lenght of the width of the little pouch... not hard to figure out) the straps were the hardest part. I made them too short and had to add extra fabric so it looks a little weird - seams right in the middle of the strap. just measure, I'm guessing it should be about 3 times the length of the bug part of the bag but you might want to make it longer just in case. there should be 2 parts for each strap (if you want it to be adjustable) and you have to get some of those weird thingies that makes straps adjustable... just look at any bookbag, you'll know what I'm talking about. if you get one that has one bar in the middle you have to attach it to the bottom part of the strap and the top part will get shorter and longer. if you get one with 2 bars in the middle (which most bookbags have) you will have to attatch it to the top part of the strap and the bottom part will get shorter and longer. I suggest buying the little doohickeys before you make the straps so you will know which part you should make longer. I made the bottom part longer and had the thing attatched to the bottom part so the top part was really short and the strap adjuster thing is all the way up on my shoulder. you should make whatever part it's going to be attatched to shorter, but if it's attatched to the top, don't make it too much shorter. finally, you'll need som REALLY strong heavy-duty material. measure your pattern to find out how much but about 1 or 2 yards will probably do it. I used brown velvet for the outside and orange callico for the inside- another mistake. it's too weak so I can't use it for every day school books. the zipper was hard to find too, but I had to get some kind of upholstry/matress zipper so it would be long enough I'm not really sure what it was. and then you just use the pattern you made! mine turned out really well despite all my mistakes, so I'm sure your's will turn out great. have fun! hope my directions were good enough... it's really not too complicated.