These Platypus Soft Bottles are a fantastic if you want a lightweight water bottle and a must have to keep in your handbag or daypack as a just-in-case back up, they fold up to nothing and weigh virtually nothing too!
TRAVEL TIP: Take an empty bottle for inflight travel and fill it after going through security (you can't take liquids on board international flights). Most airlines rarely provide enough water to combat the de-hydration caused by strong inflight airconditioning and cabin pressure.