I've seen big (500g/1kg) silica gel 'cushions' that are sold as car de-humidifiers. You simply put them in the microwave to dry them out once the've absorbed all the moisture they can, then re-use.

Anyone tried one in a bivvy in winter to reduce condensation?

In reply to Post #1
That would be a bit like trying to cool the planet using the air con in your car.

I highly doubt they do anything at all in a car. Let alone in a bivvy.

In reply to Post #3
Amazing

In reply to Post #1
I use them in my car & they work perfectly well. Not sure about a bivvy, particularly if you have the door open letting in damp air.

In reply to Post #5
Door open reduces condensation,not increases it

In reply to Post #6
So do you think it would work?

In reply to Post #6
👍🏻

In reply to Post #7
Nope

I have no idea whether a gel bag would work. We already have a reliable and effective solution. Use a wrap, 2 layers with an airspace= no condensation on the inner face of the inner tent. Flysheet on small tents, wraps on bivvies and inner compartments on large tents. It's been working for a very long time.

Wouldn't work Jon, you breathe out moisture.

In reply to Post #11
I know where it comes from Vince, and I know an overwrap will stop it on the inside of the brolly, but it doesn't stop me having a wet-on-the-inside overwrap to dry out. All I want to eliminate is the bit of condensation that I'd usually towel off, but which means I still have to open the brolly and leave it to dry once home. I thought maybe a kilo of silica gel in the spokes might prevent this. Doesn't look like it though.