Medium Slider Crib – 8"x6"x6" Terrestrial Tarantula Enclosure
Quick Summary
Smooth magnetic slider lid with optimized 3mm ventilation. One-handed access without disturbing your spider. Perfect for adult females of smaller terrestrial species and juveniles. Crystal-clear acrylic, stackable, display-ready.
Full Product Description
The Medium Slider Crib is one of our best-selling terrestrial enclosures—and for good reason. It solves the most annoying keeper friction: checking on your spider without triggering a bolt or tangled webbing.
If you've kept tarantulas in top-opening cubes or hinged enclosures, you know the problem. Cubes require two hands and trap webbing. Hinges swing awkwardly when shelves are tight. With a slider, you pull the lid forward with one hand, peek in, slide it back. Done. Your spider stays calm. No stress. No accidental escapes.
Why the Medium Slider Works
Smooth Magnetic Sliding Lid
Pull. Look. Slide back. The magnetic catch is secure—no fumbling with latches, no pinch points. You'll use this 50+ times a keeper season. This lid makes all of those interactions stress-free for both you and your spider.
8"x6"x6" – The Goldilocks Footprint
Using our Enclosure Sizing Guide methodology—roughly 3× diagonal leg span (DLS) for length and 2× DLS for width—this footprint works perfectly for:
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Adult females with a 2.5–3" DLS
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Juveniles in their final two molts before adulthood
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Specific genera: Grammostola spp., Brachypelma hamorii/auratum, Aphonopelma, small Nhandu, and comparable medium terrestrials
You can keep a spider here long-term without it outgrowing the space too quickly. Wide enough for natural burrowing behavior. The 6" height stays safe—far enough from the lid that a fall won't rupture the abdomen, but not so cavernous that prey escapes or humidity crashes.
3mm Ventilation – Dialed In
Terrestrial spiders need moderate airflow. Too much and your substrate dries between waterings. Too little and you get stagnant pockets in the enclosure corners. 3mm vent holes balance both. They allow humidity to stabilize at 60–75% RH depending on substrate choice and watering schedule—exactly where most terrestrial species thrive. This isn't a guess; it's the result of keeping tarantulas in thousands of enclosures.
Stackable Design for Scale
Whether you have 5 spiders or 50, vertical space is everything. These stack securely without gaps, so you can build clean rows on standard shelving. Visual scanning becomes faster. Organization stays intact. Your display actually looks intentional instead of chaotic. Practical for hobbyists scaling up; essential for anyone breeding.
Premium Crystal-Clear Acrylic
Laser-cut edges. No clouding. No rough seams. Your tarantulas look stunning, and the enclosure doesn't distract from the animal. Long-term UV stability means it stays clear for years, not months.
Ideal For
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Adult females of Grammostola, Brachypelma, Aphonopelma, and similar medium terrestrial genera
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Adult males of larger species (before the nomadic phase kicks in)
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Juveniles in their final growth stages
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Breeding setups and colony racks
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Display collections where aesthetics and functionality matter equally
- Keepers upgrading from less efficient access systems
Note: This is a terrestrial-only enclosure. Arboreal or fossorial species need different dimensions and access patterns.
Specifications
| Spec |
Detail |
| Dimensions |
8" L × 6" W × 6" H |
| Opening |
Sliding top lid |
| Locking |
Magnetic catch (secure, no latches) |
| Ventilation |
3mm vent holes (optimized for terrestrial humidity) |
| Material |
Laser-cut premium acrylic |
| Stacking |
Yes—designed for secure vertical stacking |
What To Pair With This Enclosure
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Substrate: 4–5" of Arachnidirt (Original or Arid blend, depending on species)
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Hide: Cork flat or half-log for security
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Water: Simple shallow water dish or misting routine
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Decor: Cork bark, leaf litter, minimal plants (optional but spider-approved)
Sizing Checklist
Before you order:
- [ ] I know my spider's diagonal leg span (DLS) — leg tip to opposite leg tip, not body length
- [ ] My spider's DLS is between 2.5–3 inches
- [ ] My spider is a ground dweller (terrestrial), not a climber or burrower
- [ ] I'm ready to check on it regularly without fear of it bolting
Not sure about any of these? Use our free Enclosure Sizing Guide — it walks through species type, sizes everything automatically, and answers the questions we get asked most.
Real Talk
We've sold thousands of these. Keepers come back to buy more because the slider access becomes habit—the good kind. You'll stop dreading enclosure checks. The tarantula stays calm. The setup scales smoothly. It's not fancy. It's just right.
Terrestrial species don't need bells and whistles. They need space, humidity control, and an owner who can check on them without drama. This enclosure delivers exactly that.
