Is the 7 gallon any wider or just taller? I bought the Lug-a-loo brand. Works OK, but a bit short front to back. I would love an extra 2-3". Not to get too personal, I know some people can hold their #1 while they go #2. I cannot. The experience is not pleasant trying to get the junk up front in while also going #2. Do-able, but not comfortable at all.
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Taller,...............easier for us older stiff knee adventurers to stand up from. Otherwise dimensions (diameter) are the same. Number 1,that is what the GEL is for. Turns liquid into a gel. I imagine kitty litter (cpst) would work, (cheaper),......just heavier after using for processing..
PS"...update 12/9/22..................................Order delivered complete and then assembled. Parts fit as designed. Kitchen trash bags fit nicely. I doubled them up 2x for leak/strength peace of mind , You can use the assembled toilet to carry the Gel pouch and a roll of TP and wipes. as well as some hand sanitizer, pre-use . They all fit inside easily for transport.
Concerning men. yes a little directional tuck is advisable for anyone with a large body frame (husky). A tight fit. Women should not have this issue, to contend with, but that said . the extra height does vastly help when standing up. This was my main concern and why I was willing to spend the extra money for the 7 gallon size. The seat is not large but it does what it is there for.
PSS:....update 12/24.22.....................Purchased a small 5 lb bag of JOHNNY CAT litter. Compact and only cost $2,79 vs $15 for the gel. So right around $80 total outlay , as I had already had trash bags on hand. It also fit in the unit for pre use transport
I hope I answered most any question you might have contemplated about this subject concerning cost and functionality. Some companies seem very willing to ask for the moon for their products. A little bulky but light weight vs say a cartridge unit.