Egg crate bed pads:
Compression bags: https://www.amazon.com/dp/B07Y9FMV9L
Easiest to use with a vacuum to compress bed pad
Also includes a pump for use to compress items for return trip
Power adapters: https://www.amazon.com/dp/B07WY4KWM8
NOTE: These JUST convert the plug - your device must run on both 110V and 220V to avoid damage
Toilet paper
If you see a wastebasket next to the toilet, that's usually a sign that toilet paper should be discarded there rather than flushed. When in doubt, ask your host or look for posted instructions.
In many parts of Brazil, especially in older buildings and smaller towns, plumbing and sewer systems were not designed to handle large amounts of toilet paper. To prevent clogged pipes and sewer backups, toilet paper is often placed in a wastebasket beside the toilet instead of being flushed.