This is the Backpacks Mod:
http://www.minecraftforum.net/topic/149 ... s-v-12629/
What is the Backpacks Mod you may ask?
The Backpacks Mod is a Minecraft Mod that adds backspacks to Minecraft! This way, you can store your items within a backpack so that when your inventory is full and you are far from home, you can take more stuff!
Of course, having 30 backpacks isn't really realistic either, so perhaps adding a rule that you can only carry 2 backpacks at a time or 1 big backpack wouldn't be bad. There is also a backpack that allows you to use a crafting menu too(3x3)!
I think this mod would be really useful because there are Trainers out there who find bosses and obtain a lot of items from them, and when they are mining for example they collect a lot of cobblestone that they want to keep, however they do not have enough space for it.
A good thing about this mod is that it really fits with the server. You can obtain leather and string, which you use to craft these backpacks from wild Pixelmon. Of course, you cannot craft the Ender Backpack(which would be useful for staff members etc.).
One important note is that you cannot store backpacks within backpacks, which is good because it stops players from having an infinite inventory.
Controls:
[Shift right click while holding a backpack on a block with inventory] to "trade" items between the two.
[Shift right click while holding a backpack] to rename the backpack.
Please, consider this mod very seriously as I believe it can really help out!