Are you worried about liquid limitations on planes as how many ounces can you take on a plane ? There are several products available in travel-sized bottles that are under this 3.4 ounce limit, including shampoo, shower gel, etc. Additionally, you can purchase reusable travel bottles and transfer some shampoo liquid from your larger bottles into the smaller ones. Long-term, this can be a major money saver, and refilling bottles also has additional benefits. Since refillable bottles and containers are available in a variety of sizes and forms, you can bring along enough product to last the duration of your vacation. All of this is significant because 3.4 ounce bottles are restricted on aircraft.