Each Apollo mission was equipped with two rucksacks providing equipment to allow for crew survival for up to 48 hours in the water after landing. This is the first of the two rucksacks flown on the historic first lunar-landing mission, Apollo 11, in 1969. It includes three water containers, one radio beacon with spare battery, three pairs of sunglasses, six packages of desalted chemicals, one desalter kit, two survival lights, one machete, and two bottles of sunscreen. The rucksack was transferred to the Smithsonian along with Command Module “Columbia” in 1970. [via]
This is currently on display in the Apollo to the Moon exhibition at the Smithsonian National Air and Space Museum in Washington, DC.