Cache Construction
Part of Food Storage Infrastructure
Distributed food caches spread risk across multiple hidden locations, ensuring that a single disaster, theft, or animal intrusion cannot destroy your entire food supply.
When survival depends on stored calories, putting all your food in one location is a critical vulnerability. A house fire, a raiding party, or a bear breaking in can wipe out months of carefully preserved food in a single event. Cache construction solves this by distributing supplies across multiple concealed locations, each independently protected from moisture, temperature extremes, rodents, and larger predators.
Cache Strategy and Site Selection
Before building any cache, develop an overall distribution plan. The goal is to balance accessibility against security and concealment.
Distribution Principles
Place caches at varying distances from your primary settlement. Near caches (within 500 meters) provide quick access for daily and weekly needs. Mid-range caches (1-3 kilometers) serve as backup supplies and waypoint stores along travel routes. Far caches (5+ kilometers) act as emergency reserves or support extended foraging trips.
The Three-Cache Minimum
Never rely on fewer than three separate cache locations. If one is discovered or destroyed, you still have two backups. Ideally, maintain five to seven active caches with rotating inventory.
Site Selection Criteria
| Factor | Ideal Conditions | Avoid |
|---|---|---|
| Drainage | High ground, sandy or gravelly soil | Low areas, clay soils, flood plains |
| Shade | Partial shade from trees or rock | Full sun exposure (heat buildup) |
| Access | Within 15 minutes walk from a trail | Steep slopes, dense brush requiring machete |
| Concealment | Natural features that hide disturbance | Open fields visible from distance |
| Water table | At least 1.5 meters below surface | Areas where you hit water digging 60 cm |
| Root systems | Clear of major tree roots | Directly under large trees |
Choose sites near distinctive natural landmarks you can relocate without maps — a lightning-struck tree, a boulder formation, a creek bend. Avoid choosing landmarks that can change, like a specific bush or log that may rot or be moved.
Underground Pit Caches
The most common and effective cache type for long-term storage in temperate and cold climates. Underground temperatures remain relatively stable year-round, typically 10-15 degrees Celsius at one meter depth.
Basic Pit Cache Construction
Step 1: Excavation. Dig a pit 60-90 cm in diameter and 90-120 cm deep. Keep the removed soil on a tarp or hide — you will need to replace it exactly. Separate topsoil from subsoil to restore layers correctly.
Step 2: Drainage layer. Place 10-15 cm of gravel or coarse sand at the bottom. This prevents water from pooling beneath your stored goods. In areas with higher water tables, extend this layer up the sides as well.
Step 3: Lining. Line the pit walls and bottom (above the drainage layer) with overlapping sheets of birch bark, with the waxy outer surface facing inward. Birch bark is naturally waterproof and rot-resistant. Alternatives include flat stones fitted tightly together, or multiple layers of large leaves sealed with pine pitch.
Pine Pitch Sealant
Heat pine resin with crushed charcoal (roughly 2:1 ratio) to create a waterproof sealant. Apply hot to seams between bark sheets or stone joints. This mixture remains flexible when cool and resists cracking through freeze-thaw cycles.
Step 4: Container placement. Place food in sealed containers — clay pots with pitch-sealed lids, tightly woven baskets lined with hide, or bark boxes. Never place food directly against the cache walls, even if lined. Leave 5-10 cm of air gap filled with dry grass or shredded bark for insulation and moisture absorption.
Step 5: Capping. Cover with a flat stone slab or a lattice of sticks topped with bark sheeting. Seal edges with pitch. Add 15-20 cm of soil, compacting gently. Replace topsoil last and scatter natural debris (leaves, pine needles, small sticks) to match the surrounding ground.
Advanced Pit Cache — The Dakota Cache
For larger stores, dig a main chamber 120 cm in diameter and 150 cm deep, with a narrow access shaft (40 cm diameter) angled from 60 cm away on the surface. This prevents rain from entering directly and makes the cache harder to detect. Line the entire chamber with stone or bark. The angled shaft can be plugged with a fitted stone or log section wrapped in hide.
Elevated Platform Caches
Essential in areas with bears, wolverines, or other large predators that can dig up underground stores.
Construction Method
Platform height: Minimum 3.5 meters above ground — bears can reach approximately 3 meters standing upright.
Support poles: Use four straight poles, 12-15 cm diameter, set 1.2 meters apart in a square pattern. Bury the bases 60 cm deep and tamp soil firmly. Alternatively, use four closely-spaced living trees if available.
Anti-climb barriers: Attach flat pieces of metal, bone, or smooth bark (60 cm wide) around each pole at the 2-meter mark, extending outward like an inverted cone. Animals cannot grip past these baffles.
| Component | Dimensions | Material |
|---|---|---|
| Support poles | 4.5 m tall, 12-15 cm diameter | Straight hardwood (oak, maple) |
| Platform frame | 1.2 m x 1.2 m | Lashed poles, 8-10 cm diameter |
| Platform deck | Full coverage | Split logs or thick bark sheets |
| Roof | Pitched, 30-degree slope | Bark shingles or thatch over pole frame |
| Baffles | 60 cm wide, cone-shaped | Smooth bark, flat stone, or sheet metal |
Access: Use a removable ladder or notched log. Always remove it after loading or unloading the cache. Store the ladder horizontally at least 10 meters away from the cache.
Wind Loading
Elevated caches catch wind. In exposed areas, add diagonal bracing between support poles and anchor guy lines to stakes or nearby trees. A collapsed cache attracts every scavenger within kilometers.
Weatherproofing the Platform
Build a pitched roof with at least 30 cm of overhang on all sides. Use overlapping bark shingles or thick thatch bundles. Line the platform deck with hide or bark to prevent rain splash from below. Wrap stored containers in additional hide or bark layers.
Tree Caches
A simpler alternative to platform caches, suitable for smaller quantities of food stored for shorter periods.
Hanging Method
Place food in a sturdy bag or bark container. Attach to a rope (braided plant fiber or rawhide). Throw or hoist the rope over a branch at least 4 meters high and at least 2 meters from the trunk. The bag should hang at least 3 meters above ground and 1.5 meters below the branch to prevent animals from reaching down.
Use a counterbalance system with two equal-weight bags for efficiency — when one goes up, the other comes down. Tie off the line on a separate tree.
Sealed Tree Hollows
Find a natural tree hollow above 3 meters. Clean it out, line with bark, and seal with a fitted wooden plug coated in pitch. Mark the tree discreetly. This method works well for small, high-value items like dried herbs, salt, or seed stock.
Waterproofing Methods
Moisture is the primary enemy of cached food. Multiple waterproofing layers provide redundancy.
Birch bark wrapping: Three overlapping layers with seams offset. The outer waxy layer of birch bark is naturally hydrophobic and can last years underground.
Pitch coating: Apply pine pitch (mixed with charcoal and animal fat for flexibility) to container exteriors. Requires reapplication every 6-12 months for underground caches.
Fat rendering: Dip cloth or hide wrapping in melted tallow. Creates a moisture barrier that also deters some insects.
Clay sealing: Form a 2-3 cm thick clay shell around containers, fire it lightly if possible. Even unfired clay provides significant moisture protection for several months.
Double-Container Method
Place a sealed inner container (pitch-coated bark box) inside a larger outer container (clay pot or stone-lined space) with dry charcoal filling the gap. Charcoal absorbs moisture, odors, and provides insect deterrence. This system can keep dried food viable for over a year underground.
Rodent Protection
Rodents are persistent and can chew through most organic materials. Defense requires physical barriers they cannot penetrate.
Stone lining: Fit flat stones tightly enough that mice cannot squeeze through gaps (mice can fit through openings as small as 6 mm). Fill remaining gaps with a mixture of clay and crushed stone.
Thorny barriers: Pack thorny branches (hawthorn, blackberry, rose) densely around the outside of your cache containers. This deters but does not fully prevent rodent access.
Aromatic deterrents: Pack dried mint, wormwood, or elderberry leaves around and between containers. These plants contain natural rodent repellents. Replace every 2-3 months as potency fades.
| Method | Effectiveness | Duration | Effort |
|---|---|---|---|
| Stone lining | Excellent | Permanent | High (initial) |
| Thorn barrier | Moderate | 6-12 months | Low |
| Aromatic herbs | Low-moderate | 2-3 months | Low (ongoing) |
| Clay seal | Good | 6-12 months | Medium |
| Charcoal fill | Moderate | 12+ months | Low |
Cache Location Marking and Mapping
You must be able to relocate caches reliably, even after months or years, while preventing others from finding them.
Natural Landmark Triangulation
From your cache location, identify three permanent landmarks (large boulders, cliff faces, distinctive old-growth trees). Record the compass bearing and pace count to each. To relocate, walk the bearing and pace count from any one landmark.
Discrete Physical Markers
Place inconspicuous markers near (not directly at) cache sites — a specific arrangement of three stones, a blaze mark on a tree facing away from the cache, or a particular type of plant transplanted nearby. Markers should look natural and mean nothing to a stranger.
Inventory Records
Maintain a written or memorized inventory of each cache:
- Location identifier (a code name, not a description)
- Date of last access
- Contents and quantities
- Expected shelf life of contents
- Condition notes from last inspection
Cache Maintenance Schedule
Regular inspection prevents catastrophic losses from slow-developing problems.
| Frequency | Task |
|---|---|
| Monthly | Check elevated caches for structural damage, animal activity |
| Quarterly | Open underground caches, inspect for moisture, rodent entry, mold |
| Biannually | Rotate oldest stock out, replace with fresh supplies |
| Annually | Re-seal all waterproofing, replace aromatic deterrents, repair structures |
Seasonal Timing
Open underground caches only during dry weather. Opening during rain or snowmelt introduces moisture. Early fall (after dry summer) is ideal for major inspections and restocking before winter.
Common Failures and Prevention
Flooding: Even “high ground” can flood during extreme events. Build underground caches with the drainage layer extending up the walls, and always include a secondary elevated or tree cache as backup.
Scent leakage: Animals can smell food through soil. Double-containerize everything, use charcoal fill for odor absorption, and avoid handling cache sites with food-contaminated hands. Wash hands with wood ash before accessing caches.
Condensation: Temperature differentials cause moisture to form inside sealed containers. Include a small cloth bundle of charcoal or dry rice inside each container as a desiccant. Replace when saturated.
Forgetting locations: Overconfidence in memory is the most common cache failure. Always maintain physical records in addition to mental maps. Store your cache map separately from all caches.
Summary
Distributed food caches are essential insurance against catastrophic loss of your food supply. Build at minimum three caches using different methods — underground pit caches for long-term stable storage, elevated platforms for bear country, and tree caches for quick-access reserves. Every cache needs multiple waterproofing layers, rodent-proof barriers (preferably stone), and regular quarterly inspections. Mark locations using natural landmark triangulation and maintain written inventories. The most common failures are moisture intrusion, scent leakage attracting animals, and forgotten locations — all preventable with proper construction technique, charcoal-based odor absorption, and disciplined record-keeping.