This mod attempts to address portable storage issues in a balanced, fun, and aesthetically-pleasing manner. It adds 4 tiers of backpacks (Basic, Iron, Gold, and Diamond), each of which can be upgraded from the previous tier to give more storage room as well as more upgrade slots. These upgrade slots can be used to apply a number of upgrades to the backpack to improve it’s functionality.
Download link: Iron Backpacks Mod 1.8.8/1.7.10