I've been using and abusing my GR1 since 2010 when it was first introduced to the market. I love that ruck. It's been everywhere and it still holds strong.
The GR0 is exactly proportionate to GR1, only 5 liters smaller. this makes it the perfect ruck for every day in my opinion. I just got one.
Like the GR1, GR0 is built to be abused. It is a simple backpack that has only the essential features, however it comes ready to be customized by the user by either attaching MOLLE gear or adding patches. Or you can leave it stealthy and blend in.
The ruck's straps are wide and comfortable and designed in a way that allows for the removal of a chest and waist straps. Once the GR0 is on your back, it will not move. You can run, you can crawl or you can walk, the ruck becomes part of you. This, by the way, is a feature on ALL GORUCK backpacks. Quality design.
Like all GORUCK products, the GR0 is made in the USA with American material by American hands. Attention to details is impressive.
The backpack opens completely flat allowing for optimum organization and easy access to your kit.
The inside of the ruck, the main compartment, has two pockets on the lid of the backpack and one pocket on the main compartment. Thge main compartment also has 3 rows of MOLLE so you can attach pockets and other gear. GORUCK has accessories that can be used for this purpose.
Overall the GR0 is a great ruck, one that can be used on both permissive and non-permissive environments.