sling bag - easy access to your gears. very taxing on your shoulder.
backpack - gentle on your shoulder and since it is a backpack, u can carry more things and for a longer period. problem is to access to things while u are on the go.
the above aside, if u think u gonna grow your gears then it is wise to get a bigger bag.
Nike just release a new bag. It's very very spacious. Buy a few paddings and it will become a camera bag that doesn't shout camera bag AT ALL.
It has a 15" laptop compartment + 2 huge & deep compartments for daily stuff (can convert 1 to house your camera equipment) + 2 bottle side pouches (1 is thermal for cold/hot drink) + MP3 compartment + many small compartments for other stuff.
All of the above at $129.
I might get 1 bcos I need to lug my lappie to school and now using Crumpler Considerate Embrassment is stressful on my shoulder.
gonna recharge now.. tml will be a long tiring day.
hope there will be wifi available where i will be staying.
btw, wishing fellow members here who are celebrating coming festival, Selamat Hari Raya.
maybe u might want to consider choosing either one...
get the compudaypack.. got laptop compartment on the back camera bag below.. and a big space for other day to day stuff like extra clothes and stuff.. you saw my bag ryan? the green one.. and best part.. its ard $80 when i got it..