I see that Snap-On makes a 4-inch slip-joint as well. From this distance, the 6-inch looks a lot more useful. Either way, the both look a bit bulky for the front pocket. If I get one, it will end up in a motorcycle tool roll.
If you like wide jaws on an adjustable wrench, ChannelLock has a small one that opens up to 42mm. I don’t have it in front of me, so I can’t say for certain it is 6”, so it could be eight. That one comes in handy on motorbikes for steering stems and fork tubes. I have no need to carry that one in a pocket.