Once again I highly recommend a ThinkTank Speed Racer V2 if you want to carry a lot and don't want a backpack or slingpak.
http://www.thinktankphoto.com/products/speed-racer-v2.aspx
On my trip to DisneyLand in May (high 70s - low 80s F temperature) I had the following in the bag (22 lbs loaded) - Canon 5D3 with 24-70 F/2.8L II mounted, 7D body, 600EX RT flash, 16-35 F/2.8, 24 F/1.4, 70-200 F/2.8, cards, batteries, etc. There are smaller versions of the same design (Speed Freak, Speed Demon) if you're not as much of a pack mule as I am!
The nice thing about this shoulder bag is that it has a padded waist strap which if tightened up a bit takes a lot of load off of the shoulder strap so that it doesn't dig in (although the waist belt can make walking awkward at times such as up stairs, etc.). Another nice feature of the waist belt is that it keeps the bag from flopping around when walking or leaning over plus it doesn't slip off of your shoulder.
Another big plus is that the bag doesn't leave your back all hot and sweaty. You can wear the bag anywhere you want (front, side, back) for variety in body load points.
I had my 5D3 on a Crumpler Industry Disgrace strap around my neck and with the ThinkTank bag positioned in front I could rest the camera on it while walking or standing to take some weight off my neck from the camera strap. With the bag swung in front it's easy to get stuff in and out (the top access zipper in the lid is useless as the opening is too small for the way I was loaded up); I changed lenses from the zoom to the fast prime for dark indoor flashless photo while standing in the line to get on the rides.
I carried the bag around the park for five days with minimal discomfort - ended up tired and sore from all the walking moreso than lugging gear around.
http://www.thinktankphoto.com/products/speed-racer-v2.aspx
On my trip to DisneyLand in May (high 70s - low 80s F temperature) I had the following in the bag (22 lbs loaded) - Canon 5D3 with 24-70 F/2.8L II mounted, 7D body, 600EX RT flash, 16-35 F/2.8, 24 F/1.4, 70-200 F/2.8, cards, batteries, etc. There are smaller versions of the same design (Speed Freak, Speed Demon) if you're not as much of a pack mule as I am!
The nice thing about this shoulder bag is that it has a padded waist strap which if tightened up a bit takes a lot of load off of the shoulder strap so that it doesn't dig in (although the waist belt can make walking awkward at times such as up stairs, etc.). Another nice feature of the waist belt is that it keeps the bag from flopping around when walking or leaning over plus it doesn't slip off of your shoulder.
Another big plus is that the bag doesn't leave your back all hot and sweaty. You can wear the bag anywhere you want (front, side, back) for variety in body load points.
I had my 5D3 on a Crumpler Industry Disgrace strap around my neck and with the ThinkTank bag positioned in front I could rest the camera on it while walking or standing to take some weight off my neck from the camera strap. With the bag swung in front it's easy to get stuff in and out (the top access zipper in the lid is useless as the opening is too small for the way I was loaded up); I changed lenses from the zoom to the fast prime for dark indoor flashless photo while standing in the line to get on the rides.
I carried the bag around the park for five days with minimal discomfort - ended up tired and sore from all the walking moreso than lugging gear around.