I use it mainly shoulder bag (compact) and the idea of transforming it into power backpack for more content is reassuring.
The appliance and its objectives are well protected. The exterior is water repellent. The interior is padded.
Slung version I return without problems my hybrid + lens + 2 additional zoom lenses + battery + spare memory cards.
The only drawback is its non-padded shoulder straps. When going on hiking / photo output, it can play on comfort.
But overall, very good product.