Well, ive been looking around for a sturdy rucksack with adjustable carrying capacities, and waterproof material for a good price, and came accross the Web-tex 3/4 PLCE which has 20ltr side packs that can be removed and also made of cordura. I havent seen one in real life (only on the internet). i wanted to get the opinion of people who have had experience with it, it would be a great help.