Bushwalk Australia

I'm looking for feedback on their resistance to rupturing when frozen.
Doing some reading on all sorts of water bottles and while not cheap they seem to be the most reasonable compromise and a bit lighter than my big Stainless Steel bottle that has very little resistance to rupture when frozen. Also I have a furry hot water bottle bag that seems to be the right size for the 2 litre size so I have a ready made pillow

I have a Source 3 litre in use just about every weekend for 3 years, made for the Army. DOES NOT hold a smell their advertising is absolutely spot on,NO KIDDING! Renowned as robust, tough as nails. I only half fill it these days, has been folded in my daypack for a long while now-no damage at all.
Look up Source tactical. Not sure if this fits the bill. Can't comment on freezing tho' sorry. Made to go in a ballistic vest can be refilled in situ. Mine pretty much always is refilled whilst in my daypack.
https://sourcetacticalgear.com/tactical ... ps-3l.html
Cheers

Just to make things even more confusing, check this one out - https://www.wildearth.com.au/buy/hydrap ... /HYD-A812M

I have been using the same one for a year straight now in the snow and heat and it is perfect. Strong and light. I dropped it from a height of about 5 meters this past weekend and it was as good as new.

3 litres is a little big to carry inside my parka tho but some nice integrated features.

What! That Hydrapak actually does what it promises?
And why were you dropping it from five metres? Bored at the camp site were we?
Sounds like a bomber unit. Good to know.

One of my main reasons for wanting a 2 litre Platypus bottle is in the pictures.
Krunt is an old hot water bottle pouch I bought for $2- on clearance when I worked at Myer and is to be used inside my parka for my Arctic trip; I hand sewed the buttons and felt tongue on

According to the US Plastics corporation:

US Plastics wrote:Polypropylene and PVC are both plastics that are brittle at temperatures below freezing. Polystyrene is considered brittle at 68°F and is very brittle at temperatures below freezing. High, medium and low polyethylene on the other hand, remains impact resistant at low temperatures. Polycarbonate and PETG also have low brittleness temperatures.

Platypus says the film portion of their 2L Platy Bottles are made from nylon/polyethylene and the spout and cap from polyethylene.
From the Platypus FAQ:

Platypus FAQ wrote:Can I freeze my Platypus bottle?
Yes. Lay it half-full on its side in freezer with all air purged. Do not over-fill. Water expands as it freezes and this can burst your bottle

I've had a 2L Platypus bottle freeze before without any issue, but it's only been occasional. I find it quite annoying as the narrow spout means you can't easily get the ice out. So I generally don't take them on winter trips.

I see the problem, that's no 2L platypus M'dog, looks more like a 50ml squashed hedgehog
The Big Zip platy would be a better option... they are kind of an odd skinny shape though.