Tim - before this gets into a 'my pannier choice is the best'

fest... [size=-2]
anyway, they're all wrong Metal Mules are the best[/size]
You mention that you are planning a RTW trip.
I think your pannier choice should be heavily influenced by your travelling ethos.
Many RTW riders have an ultra minimalist lightweight ethos which means small bikes (I know of one person planning an RTW on a 125) and soft luggage.
Others have a 'prepared for every eventuality' ethos in which case you'll want the strongest most secure luggage to protect your array of expensive gadgets, tools and spares. Weight increases significantly and so the bike gets larger to cope with it.
In many countries getting spares (even tyres) for larger bikes is something you need to either plan well ahead or be prepared to lose weeks waiting for parts to be shipped in for you.
There are arguments that soft luggage looks less likely to contain valuables and that hard luggage is going to be more of a thief magnet - but I've never had problems with either on that front.
Other RTW considerations - on road or off? If you plan to do good tarmac for the whole journey then you might compromise strength for weight. If you want to follow the 'road less travelled' you may well find that lighter but weaker panniers become a false economy.
If it were me I would be looking at the following:
Size (do you
really need that much? Are you sure?)
Strength
Security
Water/Dust proofing
Repairability (and how water/dustproof after repair)
Ease of use (quick release, how many locks/keys, handles, tie down loops etc)
After you've decided what you
really need a pannier to do then go and do the costings and see how much of it your budget will allow you to buy.
Remember that you will be living out of these day in and day out for the whole of your RTW trip so they need to function well for
you - Not someone else.
If you haven't already seen it there's a very good website with an unimaginable amount of information for the RTW traveller
www.horizonsunlimited.com
Hope that helps

and let us know how you get on
