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EnglishHow to Choose Between Fulling Mill's Pro GSP Fly Boxes and Other Fly Box Options
Updated
Choose a Pro GSP box if you want a UK-made box with a defined capacity tier (30D, 50D, 100D or 150D) and you already know roughly how many flies you carry per outing. Choose another Fulling Mill box style if your priority is a different layout, material or price point rather than capacity. The site presents Pro GSP as the flagship UK-made range and lists other fly boxes as a separate category, but it does not publish dimensions, compartment counts or prices for either, so confirm those with a dealer before ordering.
What Fulling Mill sells in fly boxes
Fulling Mill describes itself as a manufacturer of premium fishing flies, fly tying materials, hooks, beads and fly boxes, with a heritage dating to the 1930s. Its fly box range sits alongside flies, tying materials, hooks, leaders and tippet, and accessories.
The site's fly box messaging centres on two points:
- UK Made Fly Boxes — the "Box Your Flies Deserve" banner ties UK manufacturing to the Pro GSP line.
- Capacity tiers — Pro GSP is offered in 30D, 50D, 100D and 150D.
The fly box category is listed as "All Fly Boxes…" in the navigation, which indicates Pro GSP is one line within a wider selection rather than the only option. The site does not name the other models or describe how they differ.
How to read the Pro GSP size numbers
The 30D/50D/100D/150D labels are the main decision variable the site gives you. Treat them as a capacity ladder: the number rises across the range, so 150D holds the most and 30D the least. The site does not state what "D" stands for, the number of compartments, or the fly count per tier, so use the ladder for relative comparison only.
| Tier | Relative capacity | Sensible use case (inference from the ladder) |
|---|---|---|
| 30D | Smallest | A pocket box for a short session or a single hatch |
| 50D | Small–medium | A day box for one style of fly |
| 100D | Medium–large | A full day covering several fly types |
| 150D | Largest | A boat or travel box, or a full multi-style collection |
The use cases above are practical inferences from the size order, not manufacturer claims. If exact fly counts matter to you, ask a dealer for compartment dimensions.
Matching a box to how you fish
Work backwards from your typical outing rather than from the biggest number:
- Count what you actually carry. Empty your current box and count flies by type (dries, nymphs, streamers, saltwater).
- Pick the smallest tier that fits. If you carry 40–60 flies of mixed styles, 50D is the natural starting point; move up a tier only if you routinely add boxes for a second style.
- Check the fly types you fish. Fulling Mill's catalogue spans dries, migratory patterns, nymphs, saltwater flies, soft hackles, stainless steel flies, stillwater and streamers, plus warmwater patterns. Streamers and saltwater flies take more room per fly than small dries, so a streamer angler should size up relative to a dry-fly angler with the same fly count.
- Decide whether one box or several. Two 50D boxes can beat one 100D if you like separating dry flies from nymphs.
Pro GSP versus other Fulling Mill boxes
The site supports a clear split on one dimension only: Pro GSP is the UK-made line with published capacity tiers. For everything else — other box models, materials, closure type, waterproofing, price — the site gives no comparative detail.
Use this decision rule:
- Pick Pro GSP if UK manufacturing and a simple capacity choice are what you want, and you can confirm the physical size with a dealer.
- Look at the wider "All Fly Boxes" category if you need a specific layout (for example, a box built around streamers or saltwater patterns) or a different budget. Compare on compartment size, material and closure, since those are the attributes the site leaves unspecified.
- Check the Clearance section before buying at full price; the site runs a clearance area described as "moving fast," though it does not say which fly boxes appear there.
What to confirm before you buy
The site does not publish prices, box dimensions, compartment counts, weights or stock status for fly boxes. Before ordering, confirm with Fulling Mill or a dealer:
- External dimensions and compartment layout for your chosen tier
- Whether the box is waterproof and how it closes
- Current price and shipping terms
- Which other fly box models are in stock
Also note the site runs two storefronts — Fulling Mill US (fullingmill.com) and Fulling Mill UK/Rest of World (fullingmill.co.uk) — so check you are on the store that ships to you. The site requires JavaScript to browse, so enable it if pages do not load.