I have used a Rush 24 for many years and it is starting to get holes worn in it. I have had no trouble sliding it under the seat on airplanes even when loaded up with a hard hat or work boots. Will a MR 3DAP fit under a seat? It seems a little large in pics but cannot tell. Volume seems to be similar between the Rush and 3DAP. If the 3DAP is too big any suggestions on another MR pack for this use from your experience?