Bounty Hunter : 
According to HH web site, they have two models which you could use : one (Explorer Deluxe A-sym) is designed for people up to 300 lbs and another ( Safari Deluxe A-sym) up to 350 lbs.
I'm under 5'8 and under 225lbs. A Cocoon  model should fit me.
But your observation is correct : if I am to take my backpack "on board"  ( to protect it from storm/rain...),  I have to consider the total weight.
An Explorer model then seems more adequate.
And anyway, I HAVE TO loose at least 20 pounds..... more if I can...
So please, Chris, forbid forum members to speak about "Juran?on" wine,  "foie gras" and "escargots ? la Bourguignone", at least for the next 365 days ..... pleeeeeease ......  <img src="/images/graemlins/grin.gif" alt="" /> 
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Is there a difference between US and english pounds (lbs) ?
 My dictionary says a pound is 453.6 grams ; some sources seem to differ ..  <img src="/images/graemlins/confused.gif" alt="" />
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Alain