There are lots of ways to make coffee. The question, it would seem to me, is less "how to steep coffee grounds in water?" and more "find a few optima on the coffee-taste vs. equipment-weight function." I'd love to see you recruit Chris Kimball to the BPL staff :)
The parts of an Aeropress that are strictly necessary (syringe and stirring rod) are 246 grams. Damn if it doesn't make fine coffee (in about a minute including cleanup; no cozy needed as steeping time is about 10 seconds), but I tend to take tea into the woods due to weight and simplicity.
Speaking of which, those "MSR tea infusers" (http://www.rei.com/product/726094 for $17) appear to be a re-branding of the Finum infuser (http://www.specialteas.com/Tea-Preparation/Permanent-Tea-Filter-for-Mugs-Sm-Pots.html for $7), and the Chatsford infusers (http://www.specialteas.com/Tea-ware/Tea-Pots/English-Teaware/CHATSFORD-INFUSER-RED.html) are at least as good and far lighter (one for the Chatsford 6-cup pot weighs 12g). That sounds competitive vs. the strainer, and may be more convenient for tea, albeit less versatile?