Here’s a compact, travel-friendly fly box that fits your requirements:

Small Double-Sided Fly Box with Clear Lids & Foam Inserts
✔ Waterproof – Airtight seal to keep flies dry in wet conditions.
✔ Clear Lids – See your flies at a glance without opening the box.
✔ Double-Sided Design – Two compartments for organizing different fly types (e.g., dries vs. nymphs).
✔ Foam Inserts – Slotted or ripple foam to securely hold hooks.
✔ Compact & Durable – Fits in a vest or small pack; made of rugged plastic.

Recommended Options:
1. Plano Double-Sided Fly Box – Affordable, clear, and foam-lined.
2. Fishpond Tacky Fly Box – Premium, ultra-clear, and highly waterproof.
3. Orvis Double-Sided Box – Slim profile with high-visibility foam.

Would you like a magnetic option, or do you prefer only foam inserts? Also, should it fit in a shirt pocket or just a small pack?
Here’s a compact, high-quality small double-sided fly box with the features you’re looking for:

Key Features:
✔ Double-Sided Design – Two clear, hinged lids for easy access to flies on both sides.
✔ Waterproof & Airtight – Keeps flies dry and secure, even in wet conditions.
✔ Clear Lids – Allows quick visibility of fly selection without opening.
✔ Foam Inserts – Slotted or ripple foam for secure fly storage (choose based on hook size).
✔ Compact & Durable – Lightweight yet sturdy construction, ideal for travel or vest pockets.

Recommended Options:
1. Tacky Fly Box (Original or Day’s Worth) – Sleek, waterproof, and excellent foam retention.
2. Fishpond Tacky Fly Box – Compact with high-visibility foam and a secure latch.
3. Plano Guide Series – Affordable, waterproof, and foam-lined (some models have double-sided access).
4. Orvis Clearwater Fly Box – Budget-friendly with clear lids and foam inserts.

Best For:

Small Double-Sided Fly Box, Waterproof, Clear Lids, Foam Inserts

– Dry flies, nymphs, or small streamers (depending on foam type).
– Travel & wade fishing (fits easily in pockets).

Would you like a specific size recommendation or a particular foam type (slotted vs. ripple)?