12 Smart Packing Items for Health and Comfort in Your Carry-On

3. Hydration tools: collapsible bottle and electrolytes

Airplane cabins are dry—often 10 to 20 percent humidity—so proactive hydration should be a priority. A collapsible water bottle tucks into your bag for security checks and can be filled after you pass through screening. Drinking regularly prevents headaches, dry mouth, and excessive fatigue caused by cabin dehydration. Pack single-serve electrolyte packets so you can replace salts lost during long flights, especially if you sweat or have multiple time zones to cross. Choose low-sugar mixes to avoid energy spikes and prefer packets that dissolve quickly. Keep an insulated sleeve for temperature-sensitive mixes if you like warm or cold drinks. If you depend on a drink to take medicines, bring a small empty bottle through security and ask a café at the gate to fill it. Hydration pairs well with frequent light movement; stand and stretch on longer flights to help circulation. Prioritize drinking water before boarding too, since airport dining often leaves you reaching for less-healthy options.