When I travel, I always make sure I bring with me:
- enough batteries to last me one full day of shooting ... recharge them all when back at the hotel at night
- external storage (portable harddisk, like compact drive or nixvue vista) to download the pictures. Or if you prefer a laptop, that is also good.
- lens cleaning kit
What additional stuff should I bring along apart from the <a style='text-decoration: none; border-bottom: 3px double;' href="http://www.serverlogic3.com/lm/rtl3.asp?si=22&k=camera%20flash" onmouseover="window.status='camera, flash'; return true;" onmouseout="window.status=''; return true;">camera, flash</a> and tripod to the USA?
One 4x5 camera. 6 lenses. Film holders. Lee compendium hood + filters for 52 and 77. Meter. Loupe. focussing cloth. Packets of films. !300 series Gitzo and arca swiss ballhead. water. All in a Lowepro photo trekkor. Tripod handheld.
For streets? one Leica M with 24 mm lens, loaded with Tri-X. For holidays with family, add one leica R with 45-90mm zoom and one leica minilux with color films and a leica table top tripod. Never worry about batteries except for the minilux. Flash and autofocus do consume more batteries. But one extra is usually enough.