I do not carry replacement anything - I figure if my tent pole breaks I'll either use my trekking poles and/or rope or pretend it is a bivy. I do not take a tent repair kit, though I do take a repair kit for my sleeping bad. I do not take replacement buckles etc, though I have some parachute cord and duct tape. I carry my own sleeping bag and my own (redundant) fire making items, and some food. I try to make sure I have enough of the kit to survive - so if the hubby lost his pack down the river we could still make it out - might be a bit hungry or damp, but survivable.

HTH