One word of caution:
Avoid bar plug storage unless you have lots of patience or really good mechanical capability.
I have the tools that are stored in your bars and replace bar plugs. After installing them the first time, I realized that the fit is pretty fragile - they’re often based on rubber compression inside the bar, and it’s really difficult to get that to fit right.
I wouldn’t want to put one of those back on my bar after using it - I’d probably spend 10 minutes or more reinstalling it.
For a MTB, it also puts the tool weight at the most influential points on the bike:
- at the front, requiring more force to pull up the bars to get the front wheel over an obstacle
- at the ends of the bars requiring more force to turn them
I know it’s not a lot of weight, but especially for riders with less upper body strength, still worth considering and optimizing…