Man, I feel your pain. I had a similar scare a few years back while hiking in the Rockies. I was using that same Peak Design Everyday Backpack 20L V2 and my 100-400mm lens basically punched right through the divider and hit my camera body. I almost cried right there on the trail. PD is great for street photography or light commutes, but for heavy Sony glass? Not so much. In my experience, those origami dividers just cant handle the leverage of a long lens when you are actually moving. If you want something that feels like a vault, you really need to look at bags with internal core units. They provide way more structural integrity than loose dividers.

• Shimoda Action X30 V2 Starter Kit with Medium Mirrorless Core Unit
• This is my daily driver now. The core units are rigid and dont budge. The harness system is also way better for long hikes because it actually adjusts to your torso height.
• Lowepro Whistler BP 450 AW II Backpack
• If you dont care about looking like a tech-ninja and just want a tank, this is it. It is stiff, heavy, and incredibly protective. I've dropped mine down a small rock slide and everything inside was perfectly fine. Shimoda is definitely worth the extra cash for those long miles in the Olympic Peninsula... the comfort is just on another level compared to the PD straps. Honestly, once you move to a bag with a dedicated internal frame, you will wonder why you ever trusted those flimsy velcro strips. You need that structure when you're carrying an A7IV and that heavy 70-200mm. Good luck on the trip tho, that area is stunning.

TLDR: Save your money and grab the MindShift BackLight 26L Photo Daypack. I’m really happy with how this bag handles my A7IV setup. It’s way more affordable than the high-end stuff but the dividers are actually stiff and dont collapse under weight. Perfect for hiking since it has a real hip belt. Honestly, no complaints at all after dragging it through the woods for months. It just works.

> the origami style ones are just not doing it for me anymore they feel so flimsy once you actually put real weight in there. Honestly I spent way too many hours analyzing the load-bearing specs of different foams and those folding dividers just dont hold up to the literal physics of a heavy GM lens! I had a nightmare scenario once on a steep scramble in the Cascades where my gear shifted so badly it threw off my center of gravity and nearly sent me tumbling. Total disaster. You gotta look at F-Stop Mountain Series Backpack for real stability! Their whole system uses these incredibly rigid internal modules that basically turn the bag into a literal tank. I love how they use high-density cross-linked foam that wont compress even under serious torque. Just get any of their larger packs and a F-Stop Pro Internal Camera Unit. It is a total game changer for security because the glass literally cannot move once its zipped in... the structural integrity is just amazing!