A disposable underpad is a sheet you put on the bed or the chair. Medline Ultrasorbs Bed Pads are listed as a premium ultra thick adult bed pad, 30 by 36 inches, 70 count, at $121.00 when this article was written. The title also calls them heavy duty chucks for incontinence, with full body coverage. The notes we used describe a non-liquid-permeable backsheet meant to keep the mattress or another surface dry. The listing details are the ones current when the article was written. Check the Amazon page before you buy. This is not medical advice, and we did not pour water on a sample or publish a rating.
Thirty by 36 is a large rectangle for a bed or a chair. Laid with the 36-inch side across a twin or a hospital-style bed, it covers the hips and a good share of the torso. On a king mattress it covers the middle of one sleeper, not the whole bed. Know which bed you are dressing before you treat 70 pads as a house solution.

What 30 by 36 and a sealed back are for
The backsheet claim is the part that protects furniture. Non-liquid-permeable means the listing is telling you fluid should stop at the back of the pad instead of soaking into a mattress, a recliner, or a car seat. The top still has to absorb. Ultra thick and heavy duty are title words about that top. They are not a milliliter rating, and we will not invent one. If the pad saturates, fluid can still run off the edges onto the sheet. Tuck the pad flat, with no curled corner, and do not let a fitted sheet pull it into a ridge under the hips.
Full body coverage, as the title puts it, depends on the person and the bed. A taller adult may need the pad placed higher or lower depending on whether the worry is the shoulders, the hips, or the heels. The pad still has edges. Some households use a pad on the bed and another on the chair where the person sits after breakfast. That doubles the daily count, which matters at 70 to a case.

Seventy at $121.00 is about $1.73 a pad if you divide the case price by the count. That is a case purchase, not an impulse add-on. One pad a night is a bit over two months. Two a day, bed plus chair, is closer to a month. The price we saw can change. Check the live number and confirm the size still reads 30 by 36.
The listing is here: the 30 by 36 disposable underpad, 70 count, on Amazon.
Changing a pad without fighting the bed
Keep a few pads in the room where you do the change, not only in a hall closet. At night you want one within reach. Slide the fresh pad under the hips by rolling the person to one side if that is how you already transfer safely. If turning is hard, get advice from a clinician or a therapist on body mechanics. A product page is the wrong teacher for lifting.
Disposable means the pad leaves with the laundry bag or the trash, following local rules for incontinence waste. It does not go into the washer and it does not go into the toilet. A 70-count case takes shelf space. Store it dry. A damp garage wicks into cardboard and the bottom pads suffer.
Use the pad as a surface layer you can see. Hiding it under a thick blanket does not help you notice that it is time to change. Wet skin against any pad, thick or not, needs to be cleaned and dried. Barrier products are separate shopping, and irritated skin needs a professional, not another adjective on a title.
A comparison of bed-pad sizes is on the site at the bed-pad size comparison. That page is where other formats are discussed. This review stays with the disposable 30 by 36 underpad. Look at the Amazon page again before you buy. Size, count, backsheet wording, and the $121.00 price were the details current when the article was written.