I am currently looking to get the f-stops tilopa and having large icu on it. Mostly when going to shooting i have noticed that i need quite some extra stuff to carry. Clothes etc. And with tilopa can easily fit all my current gear to it. Currently i have 40litre flip backbag but that is way too small for my needs. Good with those f-stops bags is that you can get smaller/bigger icu to it and that way carry more extra or more lenses etc.