Utility packs having a flexible frame system are disclosed and described herein. A plurality of flexible frame members engage guides in the pack body to provide the pack with a resilient structure, and to further provide content protection and accessibility. Packs in accordance with various embodiments may also include a floating coupling between the shoulder harness and the pack body to enhance freedom of movement of the wearer. Embodiments may also include flexible frame members directly coupled to a waist harness to shift pack loads to the wearer's waist. Finally, a unique structure forming rod is disclosed which includes an outer member and inner member that gives items structure, durability, flexibility and resiliency.