Nalgene travel kit small the containers in this kit meet the new requirements made of sturdy hdpe pp and petg a selection of 4 guaranteed leakproof durable bottles with independent screw on caps and 2 storage jars dishwasher safe top rack here at nalgene we have very high standards when it comes to calling a container leakproof we fill up the container and the pressurize it if it does not leak we consider it to pass the test and be worthy of being called leakproof we test the j