Abstract: A container for providing supplemental storage to a bag and method of attachment therebetween are disclosed. The bag includes a first side, a second side, a first end, and a second end, and a strap that loops from a first position to a second position. The container includes a first and a second suspending member adapted for removable attachment to the strap at the first and second positions, respectively, and a body coupled to the first and second suspending members, the body including one or more waterproof pockets.