Platypus bottles collapse to fit inside the palm of your hand, making them the ideal choice for gliderpilots, travelers and anyone on the go. If you are looking for a lightweight, user-friendly bottle that travels easily and does not take up space when it iss empty, Platypus has the solution. Platy bottles are also the cleanest on the planet — the food-grade liners are free of BPA, phthalates and unwanted tastes. Like all Platy reservoirs, these bottles are manufactured with care in the USA to give you the clean, taste-free drinking experience you deserve.

WATER TANK
Having a few extra liters of water around makes everything easier. Unfortunately, having a giant empty container around does not. That is the beauty of our Water Tanks these collapsible tanks pack flat and the Big Zip opening makes filling and cleaning a breeze. Perfect solution for storing water in your trailer or tent without wasting valuable space during the journey.

2 Liter, 4 Liter, 6 Liter

Original source:
https://www.gliderpilotshop.com/water-tank.html