Don't most people who shop have brown bags laying around? People get them when shopping in grocery stores all the time. It's not really a stretch to assume the Ramsey's would have a brown paper bag in their house.
Not to mention shoving money in grocery bags is as common crime movie trope as the attache suitcase.
Much more interesting is the use of the phrase "adequate" sized attache case. Adequate size for what, I wonder. I'm pretty sure if the Ramsey's need to use a second attache case, a ransomer would not care. But why would he care in this case? Unless of course, something else was supposed to be in the attaches case.
Not every household has brown grocery bags. We don`t.
Even if Ramsey`s had in household brown paper bags, how killer could be sure about it. He was not, that’s` why the bag was left.
This particular bag stands out of the row of the other innocent grocery bags if stacked under the sink or elsewhere in the kitchen. This one brown paper bag was innocently looking to other people on the streets, while carried in the perps hands to the Ramsey`s house, and that`s why killer had chosen it, and it`s innocence ended there. Killer(s)`s kit was in the brown paper bag: gloves, rope(s), duct tape, flashlight. He (they) might had couple of those bags.
Brown paper bag(s) was used in the crime. There is no innocent explanation for:
1, It was found in the bedroom, adjacent to JB`s bedroom, it stood on the JAR bed, in the morning after the crime
2. It had the rope inside
3. The particle of this brown paper bag had been found in JB`s bed , which means at some point this brown paper bag had been in JB`s room, or used to take something out of it . “Further, small pieces of the material on this brown sack were found in the "vacuuming" of JonBenet's bed and in the body bag that was used to transport her body (SMF P 181; PSMF P 181), thereby suggesting that either the bag had been near JonBenet or that someone who had touched the bag had also touched JonBenet." (Carnes 2003:93-94).
4. Ransom had reference to the brown paper bag .
The point #3 is major evidence towards the IDI to the disappointment of RDI believers. RDI people cannot avert their eyes from one more forensic evidence, they should come with the reason why Patsy / John would bring the brown paper bag into JB`s room on the night of her killing. We cannot continue swiping the evidence under the rug, if it does not fit RDI theory. It makes the dispute between IDI and RDI worthless. Other than how I believe it got in there- the perp(s) kit was inside the bag, the crime started in JB`s room, things taken out of the bag, bag`s particles flew on the bed, I cannot phantom any other scenario.
Concerning the adequate size attaché. I believe that every briefcase, even slim one, could accommodate this amount of money. I can visualize this amount, I cannot verify with the experiment, because I would need to buy 28 small notebooks. I can only visualize, we can look at the small notebook with 100 pages for 100 bills bundled to make $10,000 and imagine 10 bundles of it, and 50 pages for 20 bills bundled to make $1,000 and imagine 18 bundles like it. It`s not mountain of the money, any briefcase could accommodate it. One brown paper bag would definitely accommodate this amount.
Why perp(s) was so detailed about the money handling down to the obsessive instructions and concerns? My personal believe that either perp(s) was psycho ( and a liar, which is always connected) , so detailed, and so wrong on almost everything, like taking money from the bank earlier then 8-10 am , morning after the Christmas, face-to-face transaction of exchange; or he (them) mocked at the victims Ramseys at every step, enjoying prolongation of the defeat and victory.