What's your favorite pieces of duck gear?

So I was thinking the other day in the blind about how everyone has a piece or two of hunting gear that has become invaluable to them. What are yours?

I'll start:
- jet sled/decoy sled: no way I could make the hunts I do without it.
- backpack blind bag: probably not as useful for people without long walks in, but for me it is a lifesaver. Traditional blind bags were awkward to carry in the mile plus I often haul in but this way I distribute the weight evenly and it gives me tremendous capacity for gear.
- fingerless wool gloves: these gloves are crucial in cold, wet weather. They retain warmth even when wet but allow dexterity needed to shoot, load shells, etc...
- shotgun butt 5 shell holder: it's awesome for keeping a handfull of shells easily accessible when walking out to finish cripples. Doesn't get in the way of shooting but allows for easy access in a pinch
- breathable waders: even in sub freezing conditions I stay warm and they are irreplaceable for long walks in. Neoprenes wear my arse out if the walk is anything more than a couple hundred yards

I realize a lot of the stuff is particular to your situation, whereas some of the stuff (fingerless wool gloves for example) are a lot more widely applicable. So what's the OB's favorite gear?