A better and more flexible alternative to carrying come-a-longs is learning how to rig mechanical advantage systems with carabiners and prussik ropes. The simplest of which is a "z drag." You are already carrying the rope - you just need a few more items like some carabiners and slings. and the ability to build a variety of anchors - such as deadmen anchors in sand (dig a hold and bury a stick/log with a rope/sling tied around it at a right angle will be a very strong anchor).
Being able to improvise in the backcountry is very helpful.
http://en.wikipedia.org/wiki/Z-drag
http://dyeclan.com/outdoors101/canyoneering101/?page=deadman-anchor






