Patent ID: 8825197

Claim:
A system, comprising: a plurality of storage modules at a materials handling facility, wherein each storage module comprises one or more locations for storing one or more items; a control system is configured to: generate a storage module capacity model that characterizes item-size category descriptors for fully-stowed storage modules; select one of the plurality of storage modules for a stow operation, wherein to select the storage module the control system is configured to: access stowability information for the plurality of storage modules, wherein the stowability information for each respective storage module indicates a capacity of the storage module to hold additional items, wherein the capacity of the storage module to hold additional items is determined according to the storage module capacity model applied to one or more item-size category descriptors for items currently held in the storage module; select the storage module for the stow operation based on the accessed stowability information; and direct performance of a stow operation for stowing items received at the materials handling facility into the selected storage module.