Kelty 35413721LR vs Marmot 23520-4430-RZ

Buy the Kelty Cosmic 20 Down, model 35413721LR, Lyons Blue and Dark Shadow, long, UPC 727880873042, when you want the mummy the title calls a 2024 model with 550-fill down. Buy the Marmot Trestles 30, model 23520-4430-RZ, Green Lichen and Greenland, regular length, right zip, when you want the synthetic bag the title rates at 30 degrees Fahrenheit. One card argues with its own year. The other calls a 30-degree bag a summer bag. Neither card prints a pound weight you can quote.

Short version. A pair of sleeping pads is the layer under the bag, not the bag. A camp pillow and a compressible pillow are a different pack item. Two closed-cell pads do not replace a hood and a draft tube. Match 35413721LR or 23520-4430-RZ before you match the word sleeping bag.

The Kelty title is a Cosmic 20 Down sleeping bag, long, and the title says 2024 Model. It also says 550 fill, a PFAS-free DWR, and recycled fabrics. The model cell is 35413721LR. The brand cell says Kelty. The color cell says Lyons Blue/Dark Shadow. The size cell says Long. The occupancy cell says 1. The UPC is 727880873042. The piece count is one bag. The photo is a bright blue mummy with a charcoal hood, which matches Lyons Blue and Dark Shadow better than a color cell written as a slash. If the bag in the mail is red or green, the color cell was not what shipped.

The feature bullets do not say 2024. They say the bag was improved for 2021, and one line says priced even lower for 2021. A title that says 2024 and bullets that say 2021 are not the same model year. Do not tell a shopper this is both. Write down the number on the stuff sack. 35413721LR is the model this card is selling. An older long Cosmic, model 35413716LR on a different ASIN, is a different card, and that older card is where a 2-pound-13-ounce line lives. Do not paste 2 pounds 13 ounces onto 35413721LR. This card's fetched bullets do not print a pound weight. If you need a pack weight, weigh the bag. The missing number is the fact.

The liner language says 50D polyester taffeta and nylon. Dual locking zippers, a draft tube, a hood, a stash pocket, trapezoid baffles, and DriDown are the construction words the bullets use. DriDown is a treatment claim, not a temperature. The 20 in the name is the temperature the family uses, and the title carries Cosmic 20. The detail block does not print an EN or ISO comfort number next to that 20 on the bullets that also say 2021. Do not invent a comfort rating, a limit rating, and an extreme rating the card did not split apart. A 20-degree name and a tested comfort number are different sentences. This card gives you the name.

Long is the size cell. A regular-length Cosmic is a different size row and often a different model suffix. The LR at the end of 35413721LR is the long clue in the part number. Left zip versus right zip is not printed as a separate cell on this card the way the Marmot card prints Right Zip. Look at the zipper before you pair it with a quilt or a second bag. Two right-zip bags zip together only if the sliders are meant to mate, and this card does not claim a mate. The occupancy cell says 1. A double bag would be a different listing.

The Marmot title is a Trestles 30, men's, water-resistant, 30 degrees Fahrenheit, right zip, regular length. The model cell is 23520-4430-RZ. The color cell says Green Lichen/Greenland. The size cell says Regular Length - Right Zip. The brand cell says Marmot. The material cell says Polyester. The occupancy cell says 1. Two UPCs appear on the listing: 889169893285 and 889169893308. Two barcodes on one card mean you write down the barcode on the sack, not the barcode you liked better. The photo is a lime-green mummy with an olive hood, which is the lichen and greenland split. If the bag is blue, it is not this color cell.

The seasons cell says Summer. A bag the title rates at 30 degrees Fahrenheit is a cold-weather bag in most camp conversations, not a summer quilt. Summer in a seasons cell is a filing error or a copy field from a different bag. Do not leave the 30-degree bag at home in October because a cell said Summer, and do not take it to a summer desert and expect the cell to be the temperature. The title's 30°F is the number the model name repeats. The seasons cell is the contradiction.

The bullets name SpiraFil, a YKK two-way zipper, a 3D footbox, and a stuff sack. SpiraFil is the synthetic fill claim. Polyester in the material cell agrees with a synthetic shell-and-fill story more than it agrees with a down story. It does not print a fill weight in grams. It does not print a pack weight in pounds. A different long left-zip Trestles card, a different ASIN, prints a weight of 3.2 and a line that says EN Rated: no. Do not assign 3.2 pounds or that EN line to 23520-4430-RZ. This regular right-zip card does not print them. Weigh the bag you unpack. Quote 30°F only as the title, not as a laboratory comfort number the card never showed.

Who should buy the down bag, and who should buy the synthetic?

Buy 35413721LR if you want the long Lyons Blue Cosmic 20 and you will treat 550 fill, PFAS-free DWR, recycled fabrics, and DriDown as title-and-bullet claims, not as a laboratory report. Buy it if long is the length you need. Buy it knowing the bullets still say 2021 while the title says 2024, so the sack stamp matters more than the year word. Buy 23520-4430-RZ if you want the regular right-zip synthetic bag in Green Lichen and you will ignore a seasons cell that says Summer. Buy it if 30°F in the title is the name you meant, and if you do not need the card to print a gram fill or a pound weight, because it does not.

Do not buy the Kelty because an older long model's 2-pound-13-ounce line sounded light. That line is not this model. Do not buy the Marmot because a different left-zip card said 3.2. That line is not this model. Do not buy either bag as a two-person quilt. Both occupancy cells say 1. Do not buy the Kelty in a regular length and expect the LR suffix to still be honest. The size cell says Long.

What the Kelty Cosmic 20 long is actually for

This card is one mummy bag with a hood, a draft tube, dual locking zippers, a stash pocket, and trapezoid baffles. Those are the words that describe how the bag closes and where a small item can sit. They are not a temperature test. The 20 in the name is the family's rating language. Down, 550 fill, and DriDown are the fill language. A synthetic bag can be warmer when it is wet. A down bag can be smaller when it is dry. This card claims a DWR and a down treatment. It does not print a wet-loft test. If you sleep in rain, the DWR claim is a shell claim, and you still need a shelter. The bag is not a bivy, and the card does not say it is.

Recycled fabrics in the title are a materials claim without a percentage on the bullets fetched for this model. Do not invent a percent. PFAS-free DWR is a chemistry claim. It does not tell you how many washes the water beads. The color Lyons Blue/Dark Shadow is the blue body and the dark hood in the photo. Multi would have been a junk color cell. This one at least names two colors. The UPC 727880873042 is the reorder string when a search box shortens the title to Cosmic and drops the model. An older 35413716LR is a different generation. If a seller's photo shows a different baffle pattern or a different logo placement, match the model on the tag before you match the word Cosmic.

What the Marmot Trestles 30 is actually for

This card is one synthetic mummy for one person, regular length, zipper on the right, color Green Lichen/Greenland. SpiraFil, a YKK two-way zipper, a 3D footbox, and a stuff sack are the parts the bullets name. Water-resistant is in the title. Water-resistant is not waterproof, and the card does not print a hydrostatic head. A 30°F title is the temperature word. Summer in the seasons cell is the word to delete from your notes. Polyester is the material cell. It fits a synthetic bag. It does not tell you the denier of the shell. The two UPCs are the reorder problem. Scan the sack. If neither barcode matches 889169893285 or 889169893308, you have a different production run or a different model.

Right zip is part of the size cell, not a footnote. A left-zip Trestles is a different part. RZ in 23520-4430-RZ is the right-zip clue in the model. Regular length is the other half of that size cell. A long Trestles is a different row. Do not buy regular because the photo looks long. A mummy photo is always long in the frame. The size cell is the length. The 3D footbox is a shape claim. It does not print a footbox circumference. If you sleep on your stomach, a mummy is the wrong category and neither card is a rectangular quilt. The occupancy cell says 1 for a reason.

How to use them without mixing the two jobs

Stuff the Kelty into the sack it came with and treat the draft tube as part of the zipper path, not as a pillow. Close the hood when the 20 in the name is the night you planned. Dry the bag before you store it. Down that stays damp is a storage failure, and the DriDown claim is not a promise that a wet bag can live in a basement. The dual locking zippers are the card's closure. If one slider is missing, the card's feature is incomplete. Send it back rather than camping on a bag that will not lock.

Stuff the Marmot and use the two-way zipper the bullets name. Right zip means the slider is on your right when you are on your back. If you wanted the slider on the left, this model is the wrong RZ. Do not wash either bag on a cycle the care tag forbids. The cards do not print a wash recipe in the bullets used here. Read the tag in the bag. Do not cite a pad's R-value as if it were the bag's temperature. The pad articles are a different piece of kit. A 30°F title on a synthetic bag and a 20 name on a down bag are not a two-degree contest you can settle with a scale, because neither card printed the pounds.

What actually fails on these two cards

The Kelty card fails when 2024 in the title and 2021 in the bullets are both pasted into a review as if they were one year. It fails when 2 pounds 13 ounces from model 35413716LR is assigned to 35413721LR. It fails when long is ignored and a regular bag is accepted because the color matched. It fails when 550 fill is treated as a warmth guarantee instead of a fill-power claim. Fill power is a loft measure. Warmth also depends on how much fill is in the bag, and this card does not print fill weight in ounces. It fails when DriDown is read as a waterproof rating.

The Marmot card fails when Summer is read as the season and 30°F is ignored. It fails when 3.2 pounds and an EN line from a different left-zip card are assigned to 23520-4430-RZ. It fails when one of the two UPCs is treated as the only barcode and the sack shows the other. It fails when right zip is treated as optional. It fails when polyester is read as a down blend. The material cell says Polyester. The bullets say SpiraFil. That is the synthetic story. It fails when water-resistant is read as a storm shell. You still need a tent.

What this comparison is not

This is not a laboratory temperature test. Neither card prints an EN comfort, limit, and extreme trio you can quote for these exact model rows. This is not a packed-weight contest. The pounds people repeat come from other model cards. This is not a review of every Cosmic temperature or every Trestles temperature. The 20 and the 30 are these two names. A Cosmic 40 or a Trestles 0 is a different bag. This is not a price quote. Use the buttons for the live listing. This is not a pad, a pillow, or a quilt comparison.

So which bag should you buy?

Buy the Kelty if you want long, Lyons Blue, model 35413721LR, 550-fill down language, and you will keep the 2021 bullets and the 2024 title in the same note instead of picking the year you prefer. Buy the Marmot if you want regular, right zip, Green Lichen, model 23520-4430-RZ, synthetic SpiraFil, and you will ignore the Summer cell. Buy neither if you needed a printed pack weight, a two-person bag, or a left-zip regular. Weigh the one you unpack. The model on the tag is the decision.

Dan Becker's film, "3 BEST SLEEPING BAGS FOR EVERY BUDGET," includes a Kelty Cosmic Down 20. In that clip the bag is described with 600 fill and a half zipper. This 2024 card says 550 fill and dual zippers. The Marmot Trestles is not in the clip. Use the film for a look at a Cosmic-family bag, not as a measurement of model 35413721LR or of 23520-4430-RZ.