The Nalgene Travel Kit Small is made of sturdy HDPE, PP and PETG. A selection of four guaranteed leakproof, durable bottles with independent screw-on caps and two storage jars. Dishwasher safe (top rack). Features: High Density Polyethylene material is BPA-free The bottle with blue cap is a ½ oz Square bottle with red cap is 2 oz Round bottle with green cap is 2 oz Two straight sided jars, 2 oz each Clear square bottle is 1 oz