Seventy-five liters can hold a lot of equipment. The harder question is how comfortably you can move it once it is all packed. That is the starting point I would use for the Mardingtop 75L Molle Hiking Internal Frame Backpacks.

Capacity Is Space, Not a Packing Target

The 75L description puts this in a large-pack category. Bulky bedding and extra clothing can use that space quickly, but it is easy to add weight simply because there is still room. I would lay out the intended contents before deciding this is the size needed.

Listed capacity: 75 liters.
Support format: Internal frame.
Exterior system: MOLLE attachments.

The Frame Needs to Fit the Person

An internal frame can help organize a backpack's support, but it does not make every large pack comfortable on every body. Torso fit, shoulder position, and waistbelt adjustment should be checked with an appropriate load.

I would compare the dimensions with the intended use as well. A vehicle-stored preparedness bag that is occasionally carried has different priorities from a pack worn for long walking days.

Use Exterior Attachments Carefully

MOLLE provides options for compatible pouches, but filling every external attachment can make a pack wider and harder to manage. Keep frequently needed items reachable while considering balance and snagging.

I would also leave room for the route from storage to the trail. A fully packed bag still needs to fit through doorways, into a vehicle, and wherever it will be kept between trips.

Who I Would Shortlist It For

This Mardingtop is worth comparing when a large carried setup is genuinely necessary. If the equipment fits comfortably in a smaller pack, I would not move up to 75 liters for its own sake. The right bag is the one that carries your selected equipment comfortably, rather than the one that encourages you to bring everything.