Sleep pad

hey folks

Was backpacking and bouldering this weekend and noticed that my air sleep pad lost a significant amount of air over night. I am 97.5% sure there are no leaks. I was wondering if it could be air pressure or cold temps? The temp went down from about 55 to 34 durning the night. Anyone hear anything like this happening?

Later.

I think the cooling temperatures would cause the warmer air inside to decrease in volume. Hence, the pad would feel less inflated. That's just a guess.

To eliminate the other 2.5% of doubt about a leak, inflate it and submerge it in your bathtub.

FrankPS wrote:I think the cooling temperatures would cause the warmer air inside to decrease in volume. Hence, the pad would feel less inflated. That's just a guess. To eliminate the other 2.5% of doubt about a leak, inflate it and submerge it in your bathtub.

I have a pad with a slow leak, and let me tell you - it's really hard to "submerge" a well-inflated air mattress. Even a bit at a time. Damn thing wants to float; what's up with that? I have tried more than once, and I just can't find the damn pinhole leak. Grrr.

Gunkiemike wrote: I have a pad with a slow leak, and let me tell you - it's really hard to "submerge" a well-inflated air mattress. Even a bit at a time. Damn thing wants to float; what's up with that? I have tried more than once, and I just can't find the damn pinhole leak. Grrr.

Once on a backpacking trip, I was able to locate a small leak in my Thermarest in a small pond. Try inflating it halfway or less. They float better with more air in them!

Edit: Don't try to submerge the whole thing at once, rather push a quarter or a sixth of it underwater at a time. Much easier than trying to get that entire flotation device underwater.

Rather than submerge, pour on soapy water and then weight the pad to force air out of any leaks. It bubbles.