>>2859742
not enough infomation
a 20kg bag is something you want a trailer for, and you could probably be able to take two or maybe even three depending on the elevation changes, distance and your personal fitness

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>>2859742
Vwry doable.

>>2859800
>ebike
you may as well post her in a kia with kids in the back

>>2859742
You could sling one bag over each side of the cross-member, though you wouldn't be able to ride it much like the guy in your pic, though you could coast on the pedals. I've carried bags of rice, a minifridge and a car battery on my bike this way (not all at once).

>>2859807
It was just the clearest picture with kids packed in it.
Those trailers have been in use for decades before e-bikes existed.

>>2859860
Clever, it's probably easier to balance two bags against eachother than try and keep it upright the entire trip back. What kind of rope/ratchet straps did you use to sling things onto the bike?

>>2859742
I don't think 45lbs is too much for a good rack, I know that mounted correctly the cheapo sunlites will do 40-50lbs without an issue. That said I think your issue is going to be density. That's just a lot of weight in a small size and unless your frame is set up for it it's going to be fairly high up. Not impossible though.

Weight is usually easier to carry on the front and that's how you will see a lot of big cargo bikes and stuff like the cargo forks set up. Trailer would also be a good idea since the weight will be much lower. Even if you found one for kids/dogs 45lbs is well within their official weight limits. I think for your purposes if not doing anything else, get a tupperware bin or similar, a couple of bolts and fender washers and attach a tub directly to the rack. That will keep the bag from getting shredded by straps or whatever. But I would be very cautious about turns and hills with that weight over the back wheel.

I am also going through similar not out of the same need but financial. I have the municipal dump that offers a free scrap yard, free mulch, and free soil if I can get to it just about a mile away. I hope acquire a bike trailer so I can get those yard supplies for free, even it's one or two containers a day. I work from home so it would be trivial to have the bike ready to rock over lunch, bounce over with a shovel, and dump it where it needs to be in the yard.

>>2859939
Rope worked for me, but straps would be easier. Just remember to put cardboard or something over the frame if you don't want to scratch up the paint, straps can damage the clearcoat with enough rubbing.