The only tool you need while riding on road on in the trails. 7 hex keys for tighening posts, pedals, stems and various bike components and even a chain rivet extractor when your chain is broken.
 
Specifications:
130g 9.5 x 3.2 x 1.8 cm
Wooden Frame
hex key: 2, 2.5, 3, 4, 5, 6, 8 mm
chain rivet extractor
star screwdriver
slotted screwdriver
cross-head screwdriver