That Clik Elite Hiker is just over the carry-on size for my airline (21.5 x 14 x 9 in). How do you have your camara in the bag and take it as carry-on?..
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That is the advantage of the F-Stop "ICU" concept. The XL-internal unit is under the 21.5 x 14 x 9 size but would be over if loaded in the back pack; so the stuff that can be damaged or is high value is carried on while the folded pack is checked.
Steve