I'm headed to Hawaii in 2 weeks for a geology field trip and I plan on bringing most of my camera gear - which amounts to: Sony digi video camera with spare tapes Canon S30 (old P&S as a backup) Canon Digi Rebel XT body Canon 35 mm f/1.4L lens Canon 18-55 mm f/3.5-5.6 lens Quantaray 70-300 mm f/4.5-5.6 macro lens Canon 430X flash spare AAA batteries for flash, camera battery charger assorted memory cards (12 GB total) cheapo tripod assorted filters The issue is that we're going to be hiking around on volcanoes most days, rain or shine, and we're required to bring our food with us along with 1-2 L of water, among other things. Tents, sleeping bags, etc. will be left in the vans for the day. At the moment, I have a Lowepro bag that barely holds all my equipment. Over the next few years as I actually gain equipment (next few years plan on buying a minimum of 3 new lenses* and eventually the successor to the Canon 5D), I was looking at purchasing the Lowepro Magnum AW camera bag. Since I don't have the equipment to currently fill it, I was going to hold off until I bought another lens. But now I'm re-considering since I think I might be able to fit all my stuff plus water and food, eliminating the need to carry a camera bag and a backpack. Bottom-line is: Is this a silly idea? Or does it seem like a good one that I won't regret? * 50 mm f/1.4; 24-70 mm f/2.8L, 70-200 mm f/2.8L.