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I've been using those system now, as it's much more reliable and stronger without adding additional weight like the Carradice, Ortlieb etc.
The biggest drawback of the old system is that the whole bag will sag over time if it's not overbuild (Carradice sag noticeably despite being lighter), Ortlieb are much more robust, but they're extraordinary heavy as if you've already loaded it up, it need to be set higher to allow a greater surface area to keep it's shape.
My only disadvantage of that newer system is that I have to bend the hook at both end a little more to prevent the bag from jumping out when going through towpath, it can also be remedy by setting it a little nose up than flat.
Is your a roll top design?
edscoble-
Yeah they're a roll top, fairly minimal.
As much as I respect Carradice, and understand the aesthetic advantages of cotton duck, from a design point of view it's an incredibly outdated material. 1000d PU Nylon is far superior in every aspect, which is good because that's why it was designed (synthetic canvas)
Another good part is that 1000d doesnt stretch as much as shouldn't be as prone to sag, also you can design in a shape thats less prone to sag too (tapered down from the front to bottom).
jtrent90
Yeah there's no tension on the modern systems, just retention on the hooks.
Shameless plug, just made a thread about the klickfix bag i just put out, might be of interest to you guys, can do full size randos too. http://www.lfgss.com/conversations/258709/