The odd ancient purse (water bucket, carry-on, whatever)

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This is Olmec 19 from [circa] 600 B.C.:

It mimics the 1300 B.C. Sumerian images and the 10,000 B.C. Göbekli Tepe line-up (shown in the post below this one).
 
These are the only images of the depicted item I can find, even after scouring hundreds of photos of ancient arts of the gods, et cetera, from China, Japan, Polynesia, Africa, the Americas, the Inuits, early Egypt, the Norse, and other cultures.
 
These links show some (also) feeble accounts of the mystery:
 
https://metro.co.uk/2017/12/13/mysterious-handbags-gods-spotted-ancient-sculptures-around-world-7157164/
 
https://www.bizsiziz.com/the-mystery-handbag-of-the-gods-depicted-in-sumer-america-and-gobekli-tepe/
 
Suggestions offered by visitors here range from silly to almost as silly and my no-explantion is even worse.
 
It’s not a UFO matter per se, but could be pertinent. How? I’m not sure, but it rankles me.
 
Like the Socorro footprints or Office Zamora’s observed insignia or some intriguing crop circles, the Sumerian “purses” beg for explanation.
 
The water bucket suggestion is feeble: Sumeria was in the “fertile crescent” – where water was abundant and the Olmecs thrived in Mexico’s wet and rainy low country where water wouldn’t need to be carried or be an object of “worship” or caring, mostly an aggravation for the Olmec peoples.
 
So, while I apologize for begging the question but, not only do I wish to see who has imaginative insights but also who might we smart enough to come up with a creative, somewhat scholarly suggestion for the noted items.
 
It would provide a few of us (unduly) obsessed with the images some mental relief.
 
RR