I am wondering if there is a way to increase your storage in your items inventory? I am running a three character party and the ability to carry out loot seems to be a big draw-back to a small party. I have the scroll cases, potion containers, and gem bags already. Just wondering....I am new to the game. Thanks in Advance

There are a couple places where you can get a bag of holding for more storage. Other than that though, you'll need to install a mod to increase stacking of objects as well as bag capacity.

If you don't mind using mods there is the Icewind Dale Tweak Pack.
You should be able to install only the components you want to use such as Bottomless Bags of Holding, Unlimited Ammo Stacks, Unlimited Jewelry and Gem Stacks, Unlimited Potion Stacks, and Unlimited Scroll stacks.

Another option is to use the in-game cheats to give your self multiple Bags of Holding that can hold items for you, then use one bag to hold the other Bags of Holding.