I wasn't convinced that I could fit 2 standard pillows side by side in the Small until I asked on Amazon, and got a definitive answer. Maybe make that clear on your website, for detail-oriented people like me? Also, pillows are the best thing to fill these with. Old clothes, towels...etc just make the bed heavy and flat; me AND the dogs didn't like it. I had to buy pillows to use, instead. Also, I bought pillow bed-bug protectors that happen to be waterproof. Those keep the pillows like brand new. Finally, I'm grateful for the bundled packages you offer. It was an incredible deal...thank you!