The Great Loop Packing List
Somewhere around Lock 34 on the Erie Canal, a piece of rebar sticking out of a concrete wall caught hold of one Looper's fender and started pulling his boat down as the water dropped. He kicked it free before anything worse happened, but the fender came away stretched beyond recognition. By the next marina, he had a knife mounted within reach of the helm, not for the water, for the lines.
That's the kind of lesson every experienced Looper eventually learns the hard way: fenders on the Great Loop aren't the same job as fenders at the home marina. Between lock walls, floating docks, fixed seawalls, and nightly raft-ups with boats you met three states ago, your fenders are working overtime for a full season and most first-timers find out what they actually need by finding out what they didn't bring.
Why Lock Walls Change Everything
A typical home dock setup, soft-sided fenders sized for gentle contact with a floating dock, doesn't hold up against a lock wall. Locks are concrete or steel, often rough, sometimes lined with old rebar, bolts, or corroded ladders, and the water level underneath you can rise or fall several feet in a matter of minutes. Loopers quickly learn to treat lock walls as a different category of contact entirely, and the advice that shows up again and again in Looper forums and trip reports is to run two distinct sets of protection: one dedicated to hard, abrasive surfaces like lock and seawalls, and a separate, cleaner set reserved for boat-to-boat contact during raft-ups and marina rafting.
The lock-wall set takes the abuse. It gets dragged, scuffed, occasionally pinched, and nobody expects it to look good after a season. The raft-up set stays presentable, because nobody wants a lock-grimed fender squeaking against a friend's hull at Docktails.
The Line-Cutting Lesson
The rebar story above isn't rare; it's common enough that seasoned Loopers treat a rigging knife as standard kit, not an afterthought. The logic is simple: if a fender or line ever hangs up on something in a lock, you want to be able to cut it free in seconds, not work a stuck line while water keeps rising. A knife within reach of the helm, and everyone aboard knowing where it is, comes up constantly in Looper prep guides right alongside AIS and a good chartplotter.
The Storage Math Nobody Warns You About
Here's the part that trips up a lot of first-time Loopers: the boats best suited to this trip, 30 to 60-foot trawlers, cruisers, and catamarans, are exactly the boats with the least spare room for gear. A full year on the Loop means fenders, lines, spare parts, provisions, and tools all competing for the same lazarette and cockpit lockers. Bringing enough fender coverage for lock walls, raft-ups, and the occasional rough marina tie-up, without giving up half your storage to do it, is a real design problem, which is part of why more Loopers are moving toward oversized fenders that deflate flat for stowage rather than carrying multiple rigid units that each need their own corner of the boat. A single large-diameter bumper that flattens for storage can cover more hull than two or three traditional fenders combined, without eating the space those extra fenders would need.
If you're sorting out what size makes sense for your boat, the Size Matters chart is a fast way to match bumper diameter to your vessel length and hull height before you leave the dock.
What to Actually Pack
Based on what experienced Loopers report bringing:
A dedicated lock-wall set - expect scuffing, treat it as expendable
A separate, cleaner set for raft-ups and marina contact
At least one oversized fender for the boats and situations where standard sizes just don't re, deep-freeboard trawlers, tidal marinas, or lock walls with a big rise and fall
A sharp knife, mounted and accessible, so a hung-up line or fender can be freed in seconds
Bow, stern, and spring lines pre-rigged before entering a lock, since re-rigging mid-lock in a hurry is how gear gets lost overboard
A plan for stowage - know where every fender lives when it's not deployed, before you're trying to find space for it at 6am on lock day
The Bigger Picture
None of this is about over-preparing for a trip that mostly goes fine, most lock transits and raft-ups are completely uneventful. It's about the handful of moments, a snagged line, a rougher-than-expected wall, an unplanned overnight raft-up six boats deep, where the right gear already being aboard is the difference between a good story and a bad one. Loopers who've done it once tend to pack lighter on almost everything the second time around, except fenders. Those, if anything, they add.