Opportunity is missed by most people because it is dressed in overalls and looks like work. - Thomas Edison
sqslabs,I respect what your saying but I just bought the 11x14 ones. I have to try them.
I fold and bag between 200-500 shirts a month right now, sometimes more, for my own designs and for 2 clients who run online apparel brands. I own two brands of flip folds, one is the actual flip fold brand and one is a knockoff. The knock off shirts will just barely squeeze into a 9x12, but it isnt easy. I don't really like the offbrand, but i needed it fast for a job a while ago, and use it on occasion. The name brand flip fold will fit into 10x13 with a little wiggle room. I tried a bunch of sizes at first and found the 10x13 to be the best for keeping the folded shirt looking nice when being boxed or mailed individually. The 11x14 allowed looser materials and smaller sizes to move around too much and bunch up or come unfolded. Obviously the bigger you go, the easier it is to bag them, but with good technique, the 10x13 are fine. Maybe one of these days I'll make a quick video showing how I do it.
My quick pointers would be:Put the flip fold about 2 inches off the edge of your table. This lets you easily grab the bottom of each side to do the flipping. Fold the bottom of the shirt up so it doesnt hang off the edge and is flush with the bottom of the flip fold, then fold the sides, doing a third fold to get the sleeves of larger sizes, then flip the bottom up and press down.Next slide the folded shirt to the bottom of the flip fold, it can be flush with the flip fold or hang off an inch or so. Now grab your bag and put it so the part with the adhesive tab is on the bottom. put a finger in each corner of the opening and put one corner then the other around the shirt and the flip fold edge, then you kind of pinch and quickly shuffle/slide the shirt into the bag and the bag over the rest of the shirt.Make sure you dont pull of the adhesive guard thing until the shirt is all the way in. You can get the air out quickly with one hand swipe up the back of the bag, or put it back on the flip fold and flip up and push down, then take off the strip, fold, and adhere. DONE.After a few you will figure out all the little motions and tricks for making the sliding in and getting the air out etc. I can fit about 140 shirts of all sizes in a standard gildan box this way. If you dont squeeze out the air, good luck getting 100. The bags all slide all over eachother, so every 10 or so, you should bag or box or you will have shirts slipping around everywhere.I'm not sure exactly how fast it all is, but you save a lot of time keeping the shirt on the flip fold while bagging instead of moving it around, and I have probably done 200+ an hour like this a few times. Some of my jobs I have to tie this string with a tag around the shirt which is a giant pain in the ass and slows the whole process down...
No way your getting 140 bagged shirts in a gildan box. Those boxes come with 72 shirts in them. I think your number is off a little. So you fold and then bag right away. I have done it a few ways. I have folded like 100 and then bagged them. I think I am faster that way. folding and bagging is to many steps to get a rhythm going for me. 200 plus an hour is lightning fast. I don't remember my numbers last time but I think I was having a hard time getting over 120 an hour. I may not be remembering right though.