I asked a similar question in the travel forum but got little response. I am leaving for a trip this weekend ( galapagos ) and I loaded my bag with my basic gear. 5D2, 40D, 24-105, 50 1.4 and 70-200 2.8. I realize that the 70-200 2.8 really makes the bag feel heavy on such a long trip ( 3 flights, it will obviously be in my carry on ) So my question is this. Should I just leave the 70-200 at home? I am not traveling to just shoot photos, I want to enjoy the trip. Or should I consider a lighter alternative on the long end. Maybe purchase a 70-300? I really don't use long lenses often so I hate to purchase a long slow lens I will probably hardly ever use. Any other thoughts would be appreciated.