In winter a few more backup options may be worth a LITTLE more weight. I'm considering more flexibility by carrying multiple smaller Plattys (they weigh very little empty. a small cost if I don't need them vs. a heavy Nalgene/other)
On a recent 2 day/2 niter on Camel's Hump (VT) in the teens I froze a full 3 L Platty & a 1 L water bottle like a block of ice overnite. Had to melt snow for water to "parboil" the 1L bottle in my pot of water to melt the ice block. It barely fit in my pot. And the 3L wasn't even close. Luckily I only had 3 snowy miles to hike out or it would have been frustrating carrying a block of ice I couldnt even use! Was afraid I'd crack the bladder if I tried to break the ice up to speed thawing process. Felt like I might have been royally screwed on a multi-day hike. Any other ideas how to melt a block of ice with just a small mug/pot?
A lesson learned here for me was it may be worth carrying an "extra" empty 1L platty as a backup container. I had two frozen ice blocks and nothing but my pot to put water in even if I found a nice stream!
I too am paranoid about my platty leaking inside my sleeping bag overnite-especially on multiday hikes once I'm committed to the next section (with no mid-way escape route; so I'm reluctant to sleep with my platty, plus it draws body heat once the hot water cools, even more if I don't boil my typical 2-3L of water (lots of fuel cost too);
On the other hand its a calculated risk to empty the Platy for nite time hoping the water source doesnt freeze overnite and I can still refill in the COLD morning.
Thought of filling plattys only half way at nite, so at least I can boil snow/water and pour it into the only half filled bladder of ice block rather than figure out how to thaw a whole ice block that's too big to fit inside my pot.
Other strategies?? Ideas??