Outdoor storage bag

A method of making a selectively openable and closable, outdoor storage bag that is at least water-resistant, comprising:

• forming a waterproof body portion from a flexible, waterproof, bag material, the bag material comprising a plurality of waterproof welded seams that define a predetermined shape of the body portion and an opening, the body portion defining an interior space within the body portion, the predetermined shape and interior space configured to receive, enclose, and store a payload;
• joining a closure mechanism to the body portion by a welded seam proximate a periphery of the opening, the closure mechanism configured to selectively open and close the opening and provide a seal that is at least water-resistant when the opening is closed;
• forming a flap of the bag material that extends from the body portion and covers the closure mechanism;
• and
• attaching a plurality of anchor points to the body portion each comprising a flexible, waterproof patch having an inner surface disposed toward the body portion and a loop of a tear-resistant material attached to an inner surface of the patch, the inner surface of the patch attached by a welded seam to an exterior surface of the body portion, wherein the body portion of the bag is waterproof and the seal is at least water-resistant.