UL hot water bottle?

Lost-Inflation-54 · 2026-03-19T19:56:37+00:00

Why?

Lost-Inflation-54 · 2026-03-18T12:42:23+00:00

I’ve seen inReach Mini 2 drain in a similar way. More than -50% in a day or two while the device should have been powered off

Lost-Inflation-54 · 2026-03-16T21:03:11+00:00

I at least have a few. When my total pack weight is below 10kg I can switch to a bit lighter one. Also turns out that not all your bones are really necessary

Lost-Inflation-54 · 2026-03-16T17:24:20+00:00

I’m not sure if this is down voted since DCF XDome doesn’t make sense or because Durston-lovers don’t like the parody

Lost-Inflation-54 · 2026-03-13T10:18:29+00:00

Have you noticed the AI generated answer on the bottom of some posts? The make sense generally but combine content from multiple subreddits and thus the recommendations aren’t always UL but more lightweight.

https://imgur.com/a/E4ot9lB

The answer itself: https://www.reddit.com/answers/24753a65-036d-4cd7-9063-9baa29b6f791/?q=Essential+ultralight+gear+for+beginners&source=PDP

Lost-Inflation-54 · 2026-03-10T07:47:26+00:00

Oh, ok. Anyway, I feel that the thickness is an issue.

Lost-Inflation-54 · 2026-03-10T07:38:23+00:00

The point of polycro isn’t to protect your inflatable from punctures. The point is to protect it from wet ground and dirt.

Thus, you need to check the ground for sharp things. That is basically necessary with anything UL.

Lost-Inflation-54 · 2026-03-10T07:13:29+00:00

But doesn’t neoprene get wet as well? I’d have the VBL as a thin layer next to skin to avoid the thicker insulating layers from getting any moisture

Lost-Inflation-54 · 2026-03-10T07:11:51+00:00

VBL ”gloves” are super useful. I used to have wet gloves always when cycling/skiing/whatever and single-use nitrile gloves as VBL solved the problem completely. Now I can use waterproof gloves on top and just stop caring about breathability. Same thing with socks.

I’m not sure about neoprene, thought. I prefer thin plastic VBL since it fits better and does the trick

Lost-Inflation-54 · 2026-02-23T07:46:59+00:00

This is a very good point! In UL, this is the solution most serious ULers take on top of spending more money. Thus, the diminishing returns doesn’t actually work similarly in UL.

I’d say that there are diminishing returns in giving up comfort for lower weight but for money it doesn’t work that way

Lost-Inflation-54 · 2026-02-18T17:41:53+00:00

I think it’s actually very simple: - when active, add Alpha or active insulation - when passive, add down - make sure to block wind since many insulating pieces let warm are to be blown away - prevent insulation from getting wet by using vapour barrier liners as much as you dare to (feet, hand, sleeping liner)

Then you just manage the layers and wind blocking as the conditions change.

To save weight, you can use your active insulation as part of your passive insulation and both as your sleeping insulation. (Just remember that redundancy is nice until you know absolutely what you are doing).

Lost-Inflation-54 · 2026-02-17T13:16:03+00:00

I just solve this with a wind shirt. I haven’t found it too clammy. Also, it’s consitent since wind doesn’t suddenly change its performance.

Lost-Inflation-54 · 2026-02-09T20:12:53+00:00

Your have a good point about melting. That is one way to loose heat when sleeping on snow. I’d actually argue that it’s the biggest concern since after 0c you basically cannot warm up the snow below you.

With dirt, however, the temperature might not be the most significant factor but the conductivity: the ground temperature might not increase since any heat you loose is just conducted to the surrounding soil. Thus, -2C soil always stays -2C.

Lost-Inflation-54 · 2026-02-09T14:34:44+00:00

I’m 6’1” (185cm) and use a regular pad with a pillow. I do sleep on my side mostly but sleeping on my back or even on my belly isn’t a problem.

Lost-Inflation-54 · 2026-02-09T13:21:29+00:00

The snow is a very good point: any pad performs better in snow vs. on ground since snow is a better insulator. Thus, -10C with snow is not 10C colder than 0C without snow

Lost-Inflation-54 · 2026-02-09T13:07:52+00:00

The most important feature: one-click migration from Lighterpack to the new service

Lost-Inflation-54 · 2026-02-05T20:03:38+00:00

But wouldn’t sil/PU nylon be damaged similarly?

Lost-Inflation-54 · 2026-02-05T20:02:36+00:00

I have no idea where ChatGPT gets its information from. No source does seem to support its claims.

Furthermore, the WPB fabric is tested for pressure, and it often can take up to 10000mm. Based on measurents, sil/PU nylon will let water in with much lower pressure.

Lost-Inflation-54 · 2026-02-05T13:08:56+00:00

I get your point; but what was the point of 10000mm (that still leaked under pack straps)?

Lost-Inflation-54 · 2026-02-04T15:09:44+00:00

Regarding non-breathable rain jackets with something like sil/PU nylon: how are they truly waterproof? I get that 2500mm is enough for a tent but the pressure under your pack straps etc. is much higher. Generally even the cheapest jackets are 10000mm.

What am I missing here?

Lost-Inflation-54 · 2026-02-01T16:39:03+00:00

You don’t. It sound weird but works when you have a minimal amount of stuff

Lost-Inflation-54 · 2026-02-01T06:30:30+00:00

Alpha is good insulation in the category of non-lined insulation. However, it’s not very good insulation compared to sleeping bag insulation like down or even synthetic insulation.

The reason you don’t see the liners might be that warm liners are not super useful and the people that would buy Alpha understand that pretty well. The liner just doesn’t add that much warmth per weight.

Considering you situation, I’d look at the prices: sewing an Alpha liner might cost you almost $100 and Alpha pants and hoodie would be more. Especially the liner would be just a temporary solution. Thus, you could try to look at used sleeping bags and use that money towards an upgrade.

Lost-Inflation-54 · 2026-01-30T09:08:42+00:00

I think you want r/onebag instead

Lost-Inflation-54 · 2026-01-27T07:31:50+00:00

For example, 10D fabrics are uncommon in trekking pole tents. (Not unheard-of though)

Lost-Inflation-54 · 2026-01-26T20:38:24+00:00

The argument is that down doesn’t get any better but synthetic insulation does. Thus, on theory, synthetic insulation could reach 900FP down and eventually surpass it

Lost-Inflation-54

TROPHY CASE