Another thing to consider: some trails, like parts of the Sierra or desert canyons, actually require WAG bags or similar portable loo systems, so having a bivvy loo can make trip planning a lot easier. They also cut down on time spent finding a privacy-friendly spot, which can be tricky in exposed areas. If you’re backpacking with a group, you’ll probably notice everyone appreciates the improved hygiene. Just be sure to pack a few extra disposal bags in case plans change or your trip goes longer than planned.