Gee I like carrying them when I can get one arm under the corner and they stay there, instead of trying to slither through my arms.
I leave it in the bag and rock it up on its corner and then kneel on it, sort of as if it were a giant brown sugar bag. As it gets lower I'll pick up the bag and drop it on it's corner and kick it, then scoop off the top. It's always been real stiff and I was surprised when I first started buying it, I guess back in September? Didn't seem like a good candidate for a feed bin - we've bought the local molassed feed and the % of molasses isn't always the same so we've dealt with tipping the barrel and beating on it to break up cold feed before.
This might be interesting when it gets down into the teens.
I think something has changed with the Senior Feed because even on warm days it is more brick like. My tack room is heated and the bags are still clumped together.
The horses are eating it just fine even my picky older guy.
I've been feeding it for about 5 years and it has always been like that. It's all about how it is stacked in large quantities (e.g. on the truck from the manufacturer) - if you get a bag from the bottom of a big stack it will be hard as a rock no matter what the temperature.
My feed store guys will often flip the bags up and down on the pavement on each end before they load in my car. That's my favorite solution.
Otherwise I do it when I get it home, although they have a knack of getting the entire contents nicely broken up. Never get lazy and put a big chunk in your feed bin thinking you can break it up with the scoop in the winter. It never works, even when accompanied by choice swear words.