Quoting Jenny Javner:" believe me, i cannot wait to ruin my HUGE maternity underware! lol &you do you mean the bed pads ... [snip!] ... the bed pads from the hospital? they let you take those?! i was wondering where i could get them, lol so thats good to know"
Have your dh/so/whoever is with you stuff them in your bag. They're usually in the drawers in the carts or the cabinets, depending on your room. After you have the baby, they'll give you these GIGANTIC pads, they go in your underwear, not on the bed (grab those while you're in labor) and you should stash as many of those as you can... you can't buy them anywhere that I've ever found, and I looked with each of my 4 kids.
Just keep telling them you need more because you don't like when they get soiled. lol They don't "let" you take them, if you ask for them, they won't just hand them over for you to stick in your bag, but if you take several extra out each time you change yours while you're there, you'll end up with a nice little stash to take home.
The earlier in your stay you start collecting them, the better. lol
I don't know why they won't just give them to you... it's not like they all don't KNOW everyone does that anyway.