I would recommend backpack mod made by myself.
Here is a link to the minecraft forum: Backpacks
I have already updatet the mod to MC 1.4.4 but it is not out yet as I give people time until tomorrow to send me new icons for the mod. So the mod will be out at saturday for 1.4.4 and 1.2.4 with bigger backpacks.
I think my mod will be helpful because especially when you have installed so much mods you have a bunch of additional items you want to carry around with you and don't forget the mining deeeeeep underground where you have always to throw some things away because you have no space left. With backpacks this is no problem any more.
The mod pack have already backpacks with Forestry ...