I have been looking at backpacks and a lot of people seem to prefer the 1000d over the 420d but I cant find anything that compares the two. Could somebody please enlighten me. Is 1000 just stiffer than 420 ? Is a backpack made of 420 no good ? The last backpack i owned was 20 years ago. I dont even think they had ripstop back then... Would 420d be good compared to that ?