Picked this guy up primarily for ski touring to be able to save a little space when its empty but feel like it will be invaluable while travelling as well. I hate cramming an empty hard sided bottle into my bag for the trek through the airport. The upside and downside is the same - lack of structure. This makes drinking a two handed affair but on balance worth the sacrifice for its ability to disappear into your pack or luggage.
Do you hate throwing away your recently purchased water bottle just to make it through the security checkpoints at the airport, just to have to buy a new bottle again? Or do you run short in baggage space and don't want to waste room in an empty non collapsable bottle? Then this is for you.