In reply to Crazy Climber:
how many days you gotta last for?
boil in the bags are heavy and dehydes i dont llike - hard to digest and they get worse with every 100m of alt gain.
what i do is by instant rice or couscous as a base, then take different dried flavourings i take out of instant noodles (ditch the noodles tho) like thai green curry etc.
i find i can usually do about 4 nights in a row before i need to switch flavours.
also, i dont rely on them as my sole meal - just the warm, salty, rehydrating element. the rest i just go with Clif bars, muesli, chocolate, more soups etc. means boiling less water (a big deal if youre melting snow).
Clif bars crushed into water are pretty good, as are gels dissolved in warm water too.
take a tube of butter (or even better, olive oil if you can find it) to add kcals. pestos also good if the flavour works (it doesnt work with thai so good - learned that the hard way).
camembert in a tube is awesome also.
works out way cheaper than special freeze dried food too. asian supermarkets have it all.