Using two reusable zip ties and this print you can always have a pump on your bike. Its hidden from view, so no worries of theft. Also it keeps the mud out of the top tube. The pump I use is a CUBE ACID Pump RACE MICRO, my bike is a Merida Big Nine 500 XL size with a Manitou Markhor fork.
Later edit: managed to squeeze 5 zipties in there also :)
Part link for custom editing
https://cad.onshape.com/documents/3fe8e3e59304f5f6efaacb3b/w/fed9188fcf9fe14dce8437a7/e/e1dc422708912832eb77ad68?renderMode=0&uiState=61a12c8d26f7ca3ce7a0214f
The author hasn't provided the model origin yet.