I really don't like having things attached on the outside.
I'm not really adverse to little PALs molle webbing on a backpack as long as the pack covers the basic features of good civilian pack and the manufacturers of the pack haven't gone Molle 'mad'. The Lowe Alpine Salient Bergen is a one of my favorite packs for outings a great deal longer than the ubiquitous BOB 72hrs period.
https://www.youtube.com/watch?v=GkT2Rfggq5kIf I need a little more capacity say for another 3-4 days of food carrying capacity I can add another 7 Litres capacity with 2 extra Molle Pouches
http://www.amazon.co.uk/Tactical-Utility...LCS+molle+pouch