I really like the idea of modifying, you can be sure it has everything you need, its easy and you have the only one like it without as hard a job. one question though, what is wrong with messenger bags, they seem good too me, its what i use for school. I think it would work well.. is it just personal preference?
When through the woods and forest glades I wander And hear the birds sing sweetly in the trees When I look down from lofty mountain grandeur And hear the brook and feel the gentle breeze