Unlike carry-on baggage, which strictly limits you to a single one-liter transparent bag of 100ml containers, there is no specific numerical limit on the number of 100ml bottles you can pack in your checked (hold) luggage. You are generally free to pack as many as you like, provided they do not contain prohibited hazardous materials (like flammable liquids) and your suitcase stays within the airline's total weight allowance. For liquids like wine or spirits, customs and safety regulations apply: for example, most airlines allow up to 5 liters of alcohol between 24% and 70% ABV per person. For non-alcoholic toiletries, the main constraint is simply the physical space and weight of your bag. However, it is always a "travel pro-tip" to seal these bottles in leak-proof bags, as the pressure changes in the cargo hold can cause even small containers to expand and leak, potentially ruining your clothes.