Playing the 3rd Willis mission Death From Above last night, I got the last required Snow Leopard skin for the Heavy Ammo bag 3/4 - which I crafted straight away, and because I'd already done the Karkadan (Kyrat Fashion Week) quest I was also able to craft that to 4/4 as well.

In the following mission Don't Look Down I died a couple times, and when I respawned I found my Heavy Ammo bag is back to 2/4. I've also lost all the Snow Leopard skins (no biggie) and the worst part, no Karkadan skin. It's gone. And presumably, because the Kyrat Fashion Week quests are one-offs, I now have no chance of getting this bag back to 4/4.

Incidentally I don't know if it's just a display glitch - whether I do actually have the increased carry capacity for those items or not (didn't check) but I assume not since it's asking me for another 5 Snow Leopard skins.
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Not happy, Jan.