Luggage allowances on buses vary by company, but most major carriers like Greyhound, FlixBus, and Megabus follow a similar "1+1" rule. Typically, you are allowed one large bag (up to 50 lbs or 22.5 kg) to be stowed in the under-bus cargo hold and one small carry-on bag that must fit under your seat or in the overhead bin. The exterior dimensions of the checked bag usually cannot exceed 62 linear inches (length + width + height). If you have extra bags, you can often pay for "excess luggage" (usually $15–$20 per bag), though space is subject to availability and is not always guaranteed. Unlike airlines, bus drivers are often the ones loading the bags, so they can be stricter about weight limits to prevent injury. Always label your bags clearly, as bus stops can be chaotic and bags are often handled quickly during short layovers.