Bought this for use on a bike (duh!). It has most things needed for running repairs, along with room to put other stuff. We added a mini first aid kit and a wind-up torch, and there was still lots of space. I know nothing about bikes and was worried that it was not comprehensive but have been told it was excellent and bits can be easily replaced when they break/are used. Was an excellent Christmas present!
I was looking for a saddle bag and this one was similarly priced (bought at £8.95) plus included emergency repair tools so it is good value.
You can fit a fair amount into the bag and the expanding zip is useful to adjust the size to your contents. It is fairly waterproof but not completely but I just store repair equipment in there. The only downside to the bag is that it doesn't attach to my bike that well and will often slip to one side.
The tools are good quality apart from the tyre levers meaning you should be able patch up most problems on the road. On my first time of using the levers one snapped and the other two are badly damaged.
Bag can be extended/shortened using the zipper around the waist, which is really useful. I carry my waterproofs, cleat covers, 2x locks, and most of the tools with the bag in the "small" position. Tools are good quality, the plastic tyre levers are very light but seem strong enough to do the job if you get a puncture. Only small criticism is that I had to wrap around the saddle rails a few times to get the bag to sit tight under the saddle, this makes it difficult to remove quickly. Overall, though, this is a good value product.