The Y-Tool comes in the perfect size to not take up much room but still . big enough to get enough torque into those bolts. Includes 4,5 and 6mm hex key sizes. Throw in your backpack and use when appropriate.

Material
Heat Treated Steel, rubber injected grip

Size
4mm, 5mm and 6mm Hex

Features
makes bolts tight, also loosens them.

Weight
If you’re worried about this, it’s time to hit the gym buddy…