Explorer 42 vs ranger

Have a mule that is a little too small for what i am doing with it , am rafting down the salt river in phoenix, az and leave a bike at granite reef and ride back up, usually bring a cooler, camera, bike seat, folding burly travoy bike trailer and then load up everything and head back up

Only using this is warm/hot weather but the mule is a little tight quarters, have not been putting a lot in the zipper compartment because we seem to need access to most of it, like the pump to top off etc

Liked the idea of having one self bailer so I like that about the ranger but the explorer has more room
Any opinions would be great