Those dolls would all fit into a couple of 5 gallon buckets - which are water tight with the right lids.

As for the photos, have them scanned and digitized then keep on a USB key or email them to yourself and perhaps another family member or close friend. If the originals ever get damaged, lost or whatever, you can always print then re-frame when needed.
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Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books.

John Lubbock