if he was _expecting_ to use all this, then thats probably the wrong approach to take. even if it was "just in case" probably better off making sure he dosn;t go under, in much the same way that you make sure you don't crash your car on the way to the cave.
if a diabetic becomes unconcious due to hypoglyceamia, this is a medical emercency.
injecting Glucagon _might_ bring them round. but once around they need seriously large amounts of carbohydrate and really shoudln';t do anything like driving for about 24 hours.
the current recomended treatment for a "normal" hypo (ie the patient has a BG of < 4 mmol/l) is 20g of refined carbohydrate. an unconcious one will require more( once you've got them back)
bearing in mind that excercise increases the body's sensitivty to insulin (ie the same amount of insulin will have more effect.) it may require more. to prevent a reoccourance, more complex carbs (other than poure sugar) should also be given
Prevention is much better than cure in these cases. Running a little high for the duration of the trip is going to cause less damage than falling unconcious. good breakfast, reduce morning insulin and keep snacking as required. learn to recognise your signs and symptons of a hypo and possibly seek advice from your diabetic doc / nurse
NEVER INJECT INSULIN INTO AN UNCONCIOUS DIABETIC
"hypostop" is less breakable than pots of jam, although i have seen squeezy packs (rather like the sports packs of lucozade)