{
  "_id": "asdf",
  "name": "John",
  "bags": [
    {
       "type": "typ1",
       "size": "size1"
    },
    {
       "type": "typ2",
       "size": "size2"
    }
  ]
}

{
  _id: "qwer",
  coll1Name: "John",
  types: ["typ1", "typ3"],
  sizes: ["siz1", "siz4"]
}
{
  _id: "zxcv",
  coll1Name: "John",
  types: ["typ2", "typ3"],
  sizes: ["siz1", "siz2"]
}
{
  _id: "fghj",
  coll1Name: "John",
  types: ["typ2", "typ3"],
  sizes: ["siz1", "siz4"]
}

{
  _id: "qwer",
  coll1Name: "John",
  types: ["typ1", "typ3"],
  sizes: ["siz1", "siz4"]
}
{
  _id: "zxcv",
  coll1Name: "John",
  types: ["typ2", "typ3"],
  sizes: ["siz1", "siz2"]
}