You can rely on the hospitality items of the hotel where you stay for some items,

But that obviously won’t work for everything. The good news is that Kiehl’s has travel size Amino Acid, Argan, Olive Fruit Oil&Sunflower Color Preserving Shampoos and Conditioners in 2.5 oz bottles for $7.00. They also offer 2.5 oz sizes of Nurturing Body Washing Cream at $8.00 and Crème de Corps body moisturizer at $11.00.