*blink blink blink* It makes sense, but how much underwear are you planning on packing and trashing???

My stuff I could trash barely filled a gallon ziploc!

If I could make a suggestion, grab either the big huge ziplocs or the storage bags that let you squeeze out the air, and SQUASH all your clothes into those. Use see through containers, and they'll be fine for going through TSA -and- be water-proof, in case your baggage is left in the rain at the airport (yes, this has happened to others during summer weather). We packed all of Fiona's Princess dresses into one of those storage bags and instead of only fitting those 3 poufy dresses in a bag, we were able to layer the rest of the stuff for that bag on top. When we got on the boat, we just hung her stuff up.
I'm also saving the plastic cubes my sheet sets come in to pack stuff into.
Hope that helps!