I thought when they measure the over all length of an "other" they mrasure from tip of the barrel minus brake/comp/flash hider unless its wielded to barrel and then to the very end of buffer tube, not the brace. So wouldn't that make a folder ok?
Here is one; check out photo # 205, thats a 2.5 gal Rubbermaid can in the garage, if they have lawnmowers or other power equipment they almost always have gas cans as well.
Hit a few of these and you have more cans then you need and probably lots other stuff too.
Estate sales are great sources for old style fuel cans at give away prices.
Check out https://www.estatesales.net/NJ/Northern-New-Jersey for listings in your area.
Last estate sale I went to they had a bunch of them in the shed, I'm already well stocked so I didn't buy any.
I would suggest several 2.5 gal cans if you don't have the strength for the 5 gal. size.
Peel, that you know how to do that, much less what it means. Sexy.
I'm sorry to say there is no good 5 gallon can solution since the leftards when all hippie on gasoline cans. We run into the glug glug problem all the time filling mowers. What we did was drilled air holes in the handles so air can get into the can as the liquid sucks the air out creating a vacuum. Old fashioned cans used to have holes in them, there was usually a little yellow cap over a nipple somewhere at the top of the can, but they did away with those when the new and improved nozzles came along. If we are in a hurry, we take the nozzle off and use a funnel.
Diesel has a higher viscosity than gasoline, so it's going to decant slower.
If you have diesel/heating oil already, look into diesel generators. You don't have to get a giant one, but they are super expensive. you won't have to worry about keeping fresh gasoline and you will already have a diesel reserve.
Lastly, if you are going the transfer pump rout, why not get a 55gallon drum and put it on wheels.