This model wraps around the standing bike pump and keeps hex (Allen) keys handy for adjustments before the trip. 

The model is made up of two pieces that wrap around the pump, and two to four clamps that keep the two main pieces together. Optionally, you can insert a rubber washer into the inner slot to increase friction against the pump.

I've attached the Fusion model so that you can make adjustments or build your own attachments. As designed, this fits over pump with 31.6mm diameter and stores the 5mm, 6mm and 7mm keys that happened to be the most common ones on my bike.