These "preform" geocache tubes are the early stage of a 2 litre soda bottle. They are virtually indestructible, dishwasher safe, and they are clear so you can see everything inside. (All preforms have a very slight greyish tint). Caps are included, and each one comes with two Rite in the Rain log sheets.

Each preform measures approx. 14cm tall, and each holds about 60 ml.