Which ones, or does it matter???

Last night, after awards night, my mum and I went to Safeway to get some milk. I was walking past the pharmacy, and I saw two men standing in the diaper aisle. I could hear them arguing, they were trying to decide which kind of diapers to buy. "Those ones look sagy." "Those ones are ugly." I thought that it was quite funny, these two men, a 50 year old dad and his 15 or so son trying to buy diapers.