You come across as being very closed minded and your comments show that you've not handled an F-Stop bag because if you had, you'd realise that some of your criticisms hold no validity!
I'm not trying to sell you a bag, what I am trying to do is offer a user related experience on the points you raise. If you want to buy an Osprey bag that is your prerogative, all I ask is don't rubbish and generalise about a product that you have not used nor have experience on.
In response to your points:
1)
Zipped closures all round - not a chance. Ever.
F-Stop offer a 20 year guarantee on their products unlike the flimsy Osprey guarantee that has get out written all over it. YKK zippers are also the best around and not the cheap equivalents found on your £30 bag found in the local Millets. A draw cord and flip buckle lid may be more 'belt and braces' but I have 8 year old YKK zippered fishing luggage that gets put through horrific regular use and they all perform flawlessly. Most zip failures are caused through negligence (packing too tightly) the easy solution is to get the right sized bag in the first place.
2)
Floating top pocket - missing
I've checked the Osprey equivalent (Stratos 36) to the Loka and the top pocket is fixed and not detachable? I actually think that the buckle design top is inferior for field use, last week I was up in the Welsh peaks in Snowdonia and the temp at the bottom was -4 before climbing up and getting into the wind chill. Having to remove gloves so as to unclip buckles is a hassle and would chill my hands very quickly. A good quality zip with sizable pull cord does the job without having to remove gloves.
3)
Pockets on hip belt - missing from one side
A pocket and Molle system on the other side is a more versatile solution, I can attach a Rolly Poly bag (
link) to the other side and carry a lens or pack of lens filters from the hip which you most certainly wouldn't fit in the little hip pockets on the Osprey bags. Good outdoor clothing generally has plenty of useable pockets anyway for such items like compasses, or just tie it to a D-Ring and secure in the elasticated webbing on the shoulder strap.
4)
Compass pouches etc on shoulder straps - missing
I tie it to the D-Ring and secure in the elasticated webbing on the shoulder strap. Pockets are too fiddly in cold/bad weather.
5)
Stuff pocket on front to keep wet stuff out of the bag or quick access of misc tat- missing
Not at all, there is a front pocket designed for exactly that complete with drainage hole to allow water to drain out. There is also the top pocket for separating out small items and then there is the main compartment space not taken up by the ICU.
6)
Waterproof zips - nice touch. but the bag isn't waterproof. So I can stick everything in a drybag? Yes but then rear access won't work and you then can't attach the icu - the main selling points of the system.
This is short sightedness on your behalf; if you had used an F-Stop bag or indeed played around with one, then you'd see there is no validity to this point you raise. The fabric is water resistant, mine has held up fine in light rain and short sharp showers. If I'm out all day in prolonged bad weather then I can attach the water proof rain cover and the clever bag design allows me to still access all my gear without the need to remove the rain cover which you CANT do with the traditional design as seen on your Osprey bags. So the main selling point does actually work and very well it does too.
7)
Accessories - available separately...
As they are from all manufacturers...
8)
And even then you've only got one rucksack - what if you want to go on a summer day walk with just the lens on the camera, or an overnight winter trip into the highlands? Are you really going to use the same rucksack? No, you'll need another one, so again you can spend lots of cash on an FStop branded bag or buy something much cheaper and better featured and put an ICU type thing, whether bought or homemade inside it.
Wrong again. Yes, I use the same system. The rucksack and relevant sized ICU are used for the day & overnight trips and then when I'm out at a show or doing a wedding/portrait shoot I select the relevant sized ICU for my camera gear and then attach a shoulder strap to D-Rings on the ICU and carry that alone as my 'camera bag', I don't need to put it into another one.