I've had one of Bob's for 6 years, and it has never failed.

HERE

Job done!

I have one of those! For lightness, dispense with the blue outer, but keep the pull-off blue cap/shot glass. This is a useful counter to those with a tendency to 'glug', thus preserving precious supplies, and also to keep the neck of your flask a hygienic distance from those suffering from halitosis and indifferent dentistry.

Thank you gentlemen! I'll have to look into that one - and see if I can get it in the US as well.

I think the answer to this is pretty simple - at least for 2019 Challengers. I'm using the freebie platypus 500ml bottle that was in this year's goodie bags.

For my hikes I wanted to take whisky and wine and obviously substantial bottles start adding up in weight and bulk.

So I got some "alcohol bladders", not unlike Evernew or CNOC water bladders but cheap, sturdy, and intended for festivals & gigs for people to smuggle alcohol in.

There are many variants, I got 4 x 1 litre and 2 x 0.5 litre for £8.

https://www.amazon.co.uk/gp/product/B00I7N9HZ6

They're actually surprisingly sturdy and well made, and when empty the roll up out of the way.