Shopper Can I use it to store liquor? Is it safe to put in my luggage?
LANCE S I actually use mine as a flask on the trail. It's a lot lighter than the rigid kind, and more compact-able at the end of the trip. Whisky is lighter than beer :-) And, while I don't think the alcohol adversely impacts the bottle material, don't expect to get 100% of the flavor/smell of the liquor out. When I use it as a water bottle there's a definite hint of whisky left behind.
It's a tough bottle, but not indestructible. I pack mine if a very tight backpack and I've never experienced/been worried it would burst - just be SURE the top is on tight AND it's completely closed! But I do wrap it pretty thoroughly to make sure no sharp objects in the pack could poke it (fishing reel, eating utensils, etc).
I've been using this and the 6L bottle (for base camp water reservoir) for several seasons now and I've been very happy. Light, durable, packable.
ADAM W You can put it in luggage,and it shouldn't break unless you put it near something that will puncture it.
It is safe to store liquor in, but I don't know if I would recommend this bottle for this since it would likely absorb the flavor of whatever you put into it.
KEVIN P Could easily store and safety keep alcohol in platypus bottles. Though putting anything that could ever break (or has value) in the hands of luggage or cargo handlers is a loosing gamble. If it so important. Find a meeting.