>>clips, I'm having trouble envisioning this size. Is quarter-inch the nominal jaw opening?<<<br><br>Yep. I buy them, and 3/16" ones, from my local office supply store in little white boxes that have (IIRC) 25 in them. The 3/8" size is more common, and probably too big. I've seen 1/4" ones in little tubs at Staples.<br><br>Now for the results:<br>The 3/16 grips the tightest, but it is a pain to get them on. So much so, that I couldn't do it with my off-hand and using my strong hand clubwise (I've always figure that if I can't do it with my weak hand while my strong hand busted up, it isn't going to happen in a survival situation).<br><br>The 1/4" didn't have to be wedged on as tightingly, so that is the size that I'm thinking of going with. I used an old bread bag as my initial testing unit, and repeatedly dropped it from about three feet off the ground. Twenty drops showed no leakage from the neck. Bread bags are thinner and less well built at the seems than a roasting bag, so it sounds good to me.<br><br>The only reservations that I have about the test is that the twisted neck was smaller than that of an oven bag, so it may be nessasary to go up to a 3/8", but if I remember to pick some up at the grocery tommorow, I will be trying it out on a more realistic vessel.<br><br><br><br>