not sure if I can help you with your choices, but
- not sure what you mean by not hardcore hiking, but my advice is to spend more on quality bag that's comfortable and can hold all your photography gear, has good weather resistance (and even then I recommend some rain cover for it), is comfortable to carry and can hold some additional things you may need while hiking like jacket, some med kit, and misc stuff
- while it sould be comfortable, then I highly recommend to try backpack before buying it if it fits your back
I personally use Deuter Guide 45L, it's not dedicated photo bag, but I carry there in cases 5D mk III, 24-70 mk II and 70-200 mk II with no problem. I'm even able to add sleeping bag, some spare clothes, food + water for about day and half and can easily attach tripod on side (on the other side goes tent). Making it total weight about 15-17kg for 3-4 day trip.