Roy
I've got a DG-600 same configuration as the 300. I mounted my EDS
below the dump valves on the ledge by my right knee. Somewhat easy
access you can reach it, see it and hear it.and it's not in the way.
Use the good hard looped velcro so you can remove when needed. Run
your tubing along the water dump cables and you can store the canula in
the pockets on the right. I went to a 13 cu' aluminum bottle gives me
about 10+ hours up on the Whites and Sierra's between 10k-18k.
Russ