I have Mustang. They make more than one type of the auto inflate. The HIT is hydrostatic, has to be submerged to auto inflate. The other type is the pill type that dissolves with water.
The pill type technology is the type that can go off due to humidity or getting soaked.
I have both types from mustang. I originally bought the HIT type, I find it fairly comfortable but it rubs on my neck a little. This past fall I was at a surplus store that bought a truck load of surplus from Bass pro/cabelas they had over 100 of the inflatable vest that all needed rearmed. All the vest still had price tags on them from the store. I found the pill style vest laid flater than the HIT style. I bought one of each (very good deal). I already had a HIT recharge kit ($90) that still had 2 years left till expiration. Bought a pill kit($30 apx) from Amazon.
I did blow up the vest to make sure the bladders were good before I bought them and put the new kits in.
Both of the vest can also be deployed manually by pulling a string. From the number of vest they had I think people at the store must pull the string more often than you would think. They pill type still had a good pill but the CO2 was empty. I tested the pill it took a couple seconds to dissolve when I put it in water.
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