i've got a badlands 4500 which works pretty well for most things. It's a modular set up with the main pack along with a detachable pack that can work as a passable daypack as long as it isn't loaded too heavy. also has a second detachable pack meant to use as a fanny pack but better to just leave it attached to the main pack.

they can be had for 350-400 new and anywhere from 225-300 used.

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Proud deep sea diver for over 25 years, fairly paid and never once needed a union to do it for me.
"if you can't do it-you can't stay"