A tri-fold bag for containment of items while walking a pet, the tri-fold bag including a collapsible main compartment section made from a water-resistant flexible material having an opening opposite a base with drain holes, and foldable along its length. A cover flap is foldable over the opening for enclosing the main compartment section when open, and foldable over the tri-fold closed configuration. Fastener straps provide for attaching a shoulder strap or a leash to the tri-fold bag during the pet walk. The tri-fold bag includes a plurality of easily accessible secondary compartments for storage of personal items while walking the pet.

Various implementations include audio devices. Certain implementations include an audio device including: a body, a slot recessed from an outer surface of the body, and a coupler in the slot, the coupler including at least one protrusion for selectively engaging an accessory attachment for an accessory.

A portable, collapsible modular container system for transportation and storage is provided. The containers are modular and can be stacked in either extended or expanded position, collapsed, or a mix thereof. The container system is modular and customizable, and attachments such as wheel, handles, carry straps, tie down straps, and other accessories, may be added or removed at the option of the user.

A carrying device made of moldable foam. The bag is divided into three sections as part of the one mold. The bag includes handles that are also made of moldable foam and include 3 sets of holes to allow the handles to be size adjustable as needed. The handles use screw buttons to attach to the bag, to allow the handles to open to attach to anything necessary. There are 10 holes within the bag in which the handles can be attached.

A portable, collapsible modular container system for transportation and storage is provided. The containers are modular and can be staked in either extended or expanded position, collapsed, or a mix thereof. The container system is modular and customizable, and attachments such as wheel, handles, carry straps, tie down straps, and other accessories, may be added or removed at the option of the user.