Two packs on a phone are comparable when the titles share a format and you can see a count in both. Open both listings, scroll past the banner, and write down the product name as printed, the size line, the count, and the price.
The pair that can be set side by side from a recorded check is a store-brand pull-on and a name-brand pull-on, both sold in an XL women’s size, with different counts. The counts differ, which is why the pack prices need a division before anyone calls one of them the cheaper buy.

The two listings and the division
Amazon Basics Postpartum Incontinence Underwear for Women, Maximum Absorbency, XL, 15 count, is the store-brand pull-on. The bullets also list occasional urinary incontinence, and the title includes odor guard and a lavender color note, with packaging that may vary. The recorded price was $17.66. Amazon showed that recorded price when the article was written. Divide 17.66 by 15. That is 1.177, or $1.18 per piece if you round to the nearest cent. Check the Amazon listing before buying; its price, count, and size may have changed since this article was written.
Depend Fresh Protection Adult Diapers for Women, XL, 26 count, states a waist of 45-54 inches. The recorded price was $23.48. Amazon showed that recorded price when the article was written. Divide 23.48 by 26. That is 0.903, or $0.90 per piece if you round to the nearest cent.

When the article was written, the Depend pack’s recorded price was higher and the price per piece was lower, using those two prices and the counts in the titles. The Amazon Basics title says postpartum. The notes recorded for that listing do not include a waist range, while Depend Fresh Protection XL states 45-54 inches. Fifteen pieces and twenty-six pieces are different amounts of product. Compare them with the counts printed on the titles.
A third tab that is not the same comparison
Prevail Daily Protective Underwear, unisex, maximum, Large, 64 count in four packs of 16, lists a waist of 44 to 58 inches. The recorded price was $53.67. Amazon showed that recorded price when the article was written. Divide 53.67 by 64 and you get about $0.84 per piece. That number is real for that listing When the article was written. It is a weak comparison to the two XL packs above. Prevail’s size word is Large, the fit is unisex, the waist line is 44 to 58, and the 64 pieces arrive as four packs of 16. Someone who needs the Depend 45-54 women’s XL is not looking at the same garment.
While the two real candidates are open, check format once more. A men’s guard is easy to land on from a search for leaks. Depend Guards, maximum, 104 count, had a recorded price of $33.99. Amazon showed that recorded price when the article was written. It is a cup-shaped pad in a pouch. The format is a guard worn inside briefs, which is a different product from the pull-ons above. If the person wears pull-on underwear, that guard does not belong in the two-pack comparison at all.
Send the person who pays both titles, both counts, both piece prices, and the waist line you actually have. A screenshot of the banner price, with the count cut off, is how the 15-count wins by accident.
Related reading: Price per piece, not price per pack and Pads, underwear, and briefs: which format to buy.