Arkel GT-18's vs. GT-54's
I have some questions on Arkel's GT-54 panniers and was hoping to get some input.
I already own a pair of GT-18's, which I use for commuting, and find them to be excellent panniers. With regard to touring (self-supported camping) my plan has been to use them as my front panniers and get the GT-54's for the rear.
But, I'm also considering getting another pair of GT-18's. I'm wondering how the 54's compare to the 18's. Are they really that much bigger? When Arkel claims 3300 cu. in. for the pair, is that with or without the tube pocket? (I'll probably call them and ask them that one)
For those of you who own them, do you find the tube pocket useful? One concern I have with it is that it just gets in the way. What about the removable butterfly pocket, do you find it to be useful? What do you find yourself using it for?
Anyway, thanks in advance for any replies.