Nappies and incontinence pads have started washing ashore on Gower.
The discovery on beaches around the peninsula had been expected, after a cargo shop shed its load in the Bristol Channel on October 11.
It was one of 11 shipping containers that went missing, some of which have been located by the Maritime and Coastguard Agency.
Other containers have washed up in Devon, and in Aberthaw, near Rhoose.
Some of the containers have opened, spreading the packets of hygiene products into the water and onto beaches.
They have washed up at Porthcawl and Aberavon Beach, prompting clean-ups by campaign group Surfers Against Sewage.
As anticipated by many, they have now started coming ashore around Gower.
They have been seen on Oxwich Bay, Tor Bay, Foxhole Cove, Langland Bay and Caswell Bay, as well as across the estuary on north Gower.
Members of the Surfers Against Sewage have now been out on beaches around Gower, after responding to sightings.
One volunteer Russell Storer, owner of Balance zero waste store in Sketty, collected bags of nappies from Three Cliffs beach.
He said: “There were nappies and bags strewn across the beach - it was a very sad sight.
“A proper coordinated plan is needed because there’s so much more to be done and they’re so heavy.
“I felt really emotional knowing we’re all trying to do our best in our own lives and something like this just completely wipes all that good work out."
A Swansea Council spokesman said: "Our cleansing teams have retrieved a quantity of the nappies from beaches at Caswell Bay and Swansea Bay and we are continuing to monitor regularly for any more that come in with the tide.
"We are aware some members of the public are also assisting by collecting any that they come across. We are extremely grateful for their support.
"Anyone that spots any more and are unable to dispose of them can contact the council so that cleansing teams can remove them".
