I think the pop up is the most genius day pack made, you can take a full weight load on the first trip without issue. I have packed a few roosies out with my 18, and a bunch of quartered bucks. I have had some heavy loads in mine on several occasions and it's done a lot better than I could have imagined it would.
the real beauty of the pop up for me is no frame sticking up getting hung up in the brush, full frames around here in the brush suck. another nice thing about the pop up is they aren't hot like a pack with more padding.
I would way rather haul a heavy load in my pop up than a kuiu pack, they handle weight better (for comparison)
the pop up will not be as comfortable with a heavy load vs a real hauler, but still plenty capable.
with that being said, I have no experience with the stryker, and being a kifaru pack, you can't go wrong there. I would no trade my pop up for any day pack there is, it's custom made for chasing roosies on the coast. if I wasn't crawling through the brush all season, I may not like it as much as I do, but it would be a great day pack anywhere.
i'm gonna buy a kifaru pack this spring, because when i'm not chasing elk here on the coast, I don't want to be putting wear and tear on my 18 since they no longer make them, and i'm due for a new hauler anyways. sometimes a little more room would be handy too.
I think you need to separate the pro and cons of each and figure out which suits you best.... on the coast, the low profile of the pop up is awesome, but in many regions, that wouldn't be as big of a pro as it is for me.
I don't think you can go wrong, and the best for me isn't necessarily the best for the next guy.
the only time i'll wear a different pack elk hunting is on trips i'm not day tripping, and that's what i'm getting the kifaru for, but it will likely be a 44mag or similar.
the pop up can handle some weight though
