One box. Forty-five minutes. Three piles: keep, pass on, undecided. The undecided pile goes into a single archival carton with the date written on the lid, and the size of that carton is the decision — when it is full, the next undecided item forces a choice about something already inside. Store that carton at 30–50 percent relative humidity and 70°F (21°C) or below. That rules out the attic, the basement and the garage on the first evening.

One container per session, in a box that cannot grow

Utah State University Extension's decluttering guidance recommends starting small and bringing one type of item together in one place rather than attacking everything. For keepsakes that means one physical container per session. A shoebox of photographs, one drawer, one bin off the closet shelf.

Give the undecided pile a fixed container so it cannot grow. A Gaylord Archival Classic Record Storage Carton with handholds measures 12 x 15 x 10 in inside, is acid-free, lignin-free and buffered at pH 8.0–9.5, and costs $14.35 for a single unit (September 2026). That is 1,800 cubic inches — roughly two full letter-size file boxes' worth of photographs, cards and small objects. Not enough for everything. That is the mechanism.

Write on the lid, in pen: the date, the room the contents came from, and a one-line list of what is inside. "March 2026 — hall closet — Grandma's letters, two ceramic birds, 1980s school photos." A box you cannot identify from the outside gets opened, re-sorted and re-closed every time, which is how sentimental sorting turns into an all-day project. The same index discipline pays off when you store seasonal decorations.

Then set a calendar reminder for six months out. Open the box that day and decide with the benefit of distance. Anything that survives two openings is a keep, and it moves to permanent storage.

30–50 percent humidity, 70°F, and never the attic

Humidity is the main variable, not temperature. The Northeast Document Conservation Center recommends keeping a mixed photograph collection between 30 and 50 percent relative humidity with daily fluctuations under 5 percent, at a temperature of 70°F or below. It also notes that the rate of chemical deterioration of most photographic materials roughly doubles with each 10°F increase in temperature. A box at 90°F in a summer attic therefore ages about four times faster than the same box in a bedroom closet.

The leaflet names the places to avoid outright: attics, basements, exterior walls, bathrooms, directly above heat sources such as fireplaces, radiators and vents, and the floor. In a US house that leaves an interior closet, upper shelf, in a room you already heat and cool. If the only space you have is a basement, a sealed plastic bin in high humidity makes mold more likely, not less.

Enclosures: what to buy, and what to throw out today

What touches the object matters as much as the room it sits in. Two rules cover almost everything.

  • Paper enclosures should be acid-free and lignin-free. The Library of Congress notes they come buffered at about pH 8.5 or neutral at about pH 7, and that enclosures should pass the Photographic Activity Test. NEDCC adds that kraft and glassine paper are too acidic to use.
  • Plastic enclosures should be uncoated polyester, polypropylene or polyethylene only. Never polyvinyl chloride (PVC), which NEDCC calls very unstable, and never plastic for nitrate or early safety film negatives. Look for the Photographic Activity Test and the PAT logo (ISO 18916).

Two things go in the trash today, because they are damaging what is inside them: self-stick or "magnetic" photo albums, and any pressure-sensitive tape holding a photograph to a page. The Library of Congress lists both as things to avoid. Slide the photographs out where they come free without force. Leave the stuck ones alone rather than tearing the emulsion.

Photograph the object, then let the object go

For anything bulky whose value is the memory rather than the thing — a child's art project, a trophy, a set of concert T-shirts — take one well-lit photograph, write the description into the filename or the caption field, and pass the object on. A shoebox of 40 school art projects becomes a folder of 40 images and one representative original.

Write the description as you go. Not later. "Ceramic bird, blue glaze, from the dining room cabinet, believed to be from Aunt Ruth, unconfirmed" is worth more in ten years than a photograph with no context. Mark the uncertain parts as uncertain, rather than turning a guess about a relative or a year into family fact. Those notes belong where the household already keeps written records, alongside the rest of your household reference folder.

Set a timer for 45 minutes and pull down exactly one container. Sort into three piles on a clean table and move fast. The first pass is sorting, not deciding. Everything in the "pass on" pile goes straight into a bag with a destination and a date attached, so it leaves the house instead of becoming a new pile — the same step that keeps outgoing donations and returns moving. The keep pile goes back into whatever permanent storage it already has. The undecided pile goes into a labeled carton, dated on the lid, shelved in an interior closet, off the floor, in a room you heat and cool. Then stop. The next container is a different session, and in six months the box you closed today opens much easier than it closed.

Sources and references