WRONG!!!!! i got mine for $136 haha haha beat that one buddy lol

Buy smaller bags, have it fit into a current bag and buy it more often?

It's more expesive that way, and if you have a big ass dog like I do, dog food adds up. Not to mention that he goes through a huge bad pretty quick, if I bought the small bags I'd be at the pet store every week.

In the time it takes to figure out a solution and implement it you could do 5 runs to the store and stock up on dog food for a good long while...

Do you really want to break your back/crash/look like a fool while wrestling with a monstruous sack of dog food? I'd just buy the biggest sack that fits into my backpack/messenger bag. It doesn't have to fit in completely, it can stick out the top.

Although I have to say I like the stem+bullhorn rack idea. But you'd need a helluva long stem and bullhorn to get a 35lbs sack to fit on.

With so much concentrated weight, this will be a challenge. Either split it up and shift it about four seperate panniers or else get a trailer.

to the op - give us some more info as to what bags you have
what are we dealing with
do you have any bike coops, thrift stores, or lbs that you could get cheap bike parts at?
do you have any friends that work in metal shops, near a college with welding access, or general diy scene?

if you have panniers you might have a rear rack. strap it across the top of the rack.

done any hiking/climbing/camping/traveling, or have a friend who does? use/borrow a large internal frame backpack.

get a front rack off of an old 3speed or crusier bike and throw the 35lber on there

get a $30 big front deli basket from a bike shop - the nice, heavy duty Wald brand kind. those things can hold alot, since they clip back onto your bars. ive seen dudes put their significant others in the basket and ride around. https://www.bikecult.com

using the same wald supports make yourself a front rack from scrap steel. or buy the heavy duty one from CETMA for $80 ppd. https://www.cetmaracks.com/

a good messenger bag will go a long way, and is worth the investment. read one of the hundreds of posts about chrome vs reload vs pac vs frieght vs bagjack vs crumpler vs manhattan portage vs bailey vs whomever. spend $150 and be happy forever.

or go bigger and get a trailer. i personally dont like the bob, but love my bikebox trailer. i put this thing to the test on a 3500 mile tour around europe, including paris-roubaix course and other muddy farmroads of italy. i keep using it all the time to pull 2 record cases around when i dj - at 120+ pounds, and the trailer handles it with ease. the 20" mags use wheelchair hubs so you push the center and they pop off easily - no unbolting or tools to fold it down. the board at the bottom uses crezon, which is an exterior plywood used in signmaking - its pretty weatherproof. the price has gone up since i bought mine, but i would still say at $279 cdn/$240 usd its a good deal. https://www.bikebox.ca/html/detailmodular_small.php

I'd just get some of the nylon webbing straps with buckles, the kind that hikers use, and tie a loop around each end of the bag, then just sling it over your shoulder like a messenger bag. You could even add a second strap for a stabilizer, and you'd have a complete dog-food-messenger bag on the cheap.

I was out completing our holiday purchases. I carred back five bottles of wine in two panniers and my rear rack bag. That has to be 20 plus some pounds?

5 bottles of wine? 12 pounds tops.

yeah. but, I had a large box of chocolates bungied on my rear rack and some groceries. Somehow they all fit.