Hennessy Hammock Safari Deluxe Zip XXL M66 review

This is a source-based assessment of Hennessy Hammock’s standard US Safari Deluxe Zip XXL, SKU M66. I have not owned, slept in, measured or load-tested it; this evaluation uses the exact manufacturer listing, the maker’s comparison chart, the recorded CPSC recall search and the corresponding custom Safari listing. The important distinction is package identity: M66 is the fixed stock-rainfly offer, while Hennessy also lists a separate Safari custom builder that starts with a body and selected webbing and makes fly selection a separate step.

The M66 is the stock-fly Safari package

The manufacturer identifies the exact standard item as product 306421915, SKU M66 and UPC 832667454441. Its page presents the hammock with a stock rainfly and complimentary webbing; the included-items copy specifies an attached mosquito net, detachable fly, support ropes, a compression sack with setup instructions and 42-inch TreeHugger webbing. This is useful if the shopping question is whether screen, cover and straps appear in one package, but it still pays to check the exact seller cart and package description before ordering.

That fixed arrangement differs from Hennessy’s separate “Customize your Safari Deluxe Zip” offer. The custom listing asks the shopper to select one of several TreeHugger strap lengths and treats the fly as an additional choice, rather than including M66’s stock hex fly at the initial step. The two offers share the Safari name and the model page’s body dimensions, but they are not interchangeable catalogue entries. M66 also should not be assumed to include optional SnakeSkins: the manufacturer explains that people can use separate sets to collapse the hammock bottom and rainfly independently.

XXL measurements are screening figures, not fit evidence

Hennessy lists 144 by 59 inches of lower fabric, so the 144-inch body length converts to 12 feet. The same product page states a seven-foot height limit and a 350-pound hammock limit. These numbers make M66 unusually large in this reviewed group, and they help distinguish it from the shorter 130-inch, 300-pound Explorer Deluxe Zip XL. They do not establish a comfortable lay for a particular person, reveal usable sleeping width, or guarantee that every tree spacing works. A fabric measurement is not the anchor span.

The product page uses language about a couple staying under a combined 350 pounds. That is the maker’s description, not independent evidence of two-person comfort, stability or a separate shared-use setup. I would not convert a capacity number into a promise of comfortable or appropriate occupancy. Likewise, the 2,100-pound rope-test figure and the maker’s strap description are individual component details, not a combined capacity rating for hammock, rope, webbing, connectors, anchors and trees. Check the instructions and each component’s own condition and limits.

A generous stock fly does not add warmth

The stock cover is a double-wide hex shape, listed as 143 inches along the center line and 120 inches across. That is a more specific package description than an assumption based on the model’s XXL name. The page also lists an asymmetrical body and structural ridgeline, side entry through a heavy-duty #10 YKK zipper with two double sliders, and attached 30D No-See-Um mesh. Those features describe the supplied arrangement; they are not storm testing or a guarantee against condensation, wind-driven rain or insects in every setup.

No under-body insulation is listed in the standard M66 contents. A rainfly and mesh address different exposure questions from warmth underneath the sleeper, so a cold-night plan requires separately selected, compatible insulation and attention to the forecast. The manufacturer also points out that Safari’s broad hex fly and hammock bottom may call for separate SnakeSkins if both are to be bundled for packing. Neither that packing accessory nor a warm underquilt should be assumed from a product photo.

The fabric and packed-mass record is unsettled

The exact M66 page calls the hammock fabric 70D polyurethane-coated polyester ripstop. Hennessy’s comparison chart instead lists Safari Deluxe XXL as 210D nylon. Both are first-party descriptions, so I retain the conflict rather than choosing the number that sounds tougher. Ask the manufacturer which current construction applies if fiber type or repair materials are decisive.

Weight needs the same caution. The product page states 4 pounds 7 ounces / 2,024 grams before the separately listed four-ounce webbing. The comparison chart lists 3 pounds 14 ounces and shows 1,760 / 1,927 grams without explaining the different metric figures. These values do not reconcile. I therefore do not publish a settled packed weight, rank it by weight, or treat a page claim as a measurement from this review. The listed 5-by-8-by-12-inch packed size is another manufacturer specification, not a reviewer’s pack test.

Who should compare it, and what to verify

M66 is a candidate for a shopper whose requirements genuinely call for a 12-foot-listed body, attached net, included stock cover and same-package webbing. Its stronger case over the custom Safari offer is convenience of the fixed stock fly package; the custom version offers selected webbing lengths but begins without the cover. Its higher capacity and length also distinguish it from reviewed XL bodies, though the number alone should not be used to make a comfort or shared-sleep decision.

Before purchase, confirm the title and M66 SKU, the stock double-wide hex fly, 42-inch webbing, attached screen, ropes and sack in the seller’s exact package. Ask Hennessy to clarify the fabric and weight conflicts if either affects your choice. Plan insulation separately, make sure the tree or stand arrangement is permitted by the instructions, and verify current safety notices and seller terms. A CPSC recall search for the product phrase returned no record in the checked snapshot; that limited search is not a safety certification or proof that no notices or incidents exist. This assessment is a careful reading of published sources, not a field demonstration or promise of overnight comfort.

A separate M66 demo offer has an offer-specific extra and unknown condition

A separately observed 2026 “Demo” / “Odds and Ends” sale listing keeps SKU M66 and UPC 832667454441, matching the standard M66 model reviewed here. That page says “Free Snakeskins Included,” an offer-specific package detail; it does not mean every standard M66 package contains them. The same sale page does not describe the particular display/use history, defect or physical condition of an individual unit, and its gallery shows common model imagery rather than that unit. If considering this separate offer, ask the seller to identify the exact condition, included parts, return terms and current package before ordering. It remains the M66 model, not a new body-size or capacity variant, but the sale offer should not be mistaken for the standard listing’s contents.