BioSwiss Clear Plastic Travel Bottles - 4 Ct.

These do exactly what I need them to do - which is make it through TSA so you can avoid checking a bag. They also hold enough to make it through about two weeks (I wash my hair every other day if not every day). The plastic quality is not great, the one my shampoo is in has had a crease down it from squeezing it since the first trip I took them on - but they're six bucks, they make it through TSA, they don't leak and it also comes with a spray bottle if you're a leave-in conditioner freak like me as well as an extra bottle that looks different from the other bottles for whatever else you use in your regime.