What Justin and James said…
“SUL” — if you’re into definitions — is defined as a base weight of 5 lbs or less, which means that a 2lb9oz shelter comprises more than half the base weight. There are folks who use a Big Agnes Fly Creek 2 (which looks an awful lot like the Ghost UL2… or is that vice versa??) as part of a “UL” (10 lbs or under base), but must cut more weight elsewhere to compensate.
All that aside, however, most people who’ve been at this long enough have dispensed with the labels and use the lightest gear that they can afford that keeps them comfortable and gets the job done, or use cheaper alternatives or MYOG, put it all in the lightest, comfortable pack that meets the same criteria and call it good. “SUL” and “UL” still remain useful IMVHO because they encourage folks who are “new to the game” to see what is possible when striving to lose pack weight by looking at the gear lists of those who’ve done it before.
When the time of year and conditions are juuusssst right (mild weather, few bugs) I’ll do the occasional “SUL-ish” 1- or 2-night trip. For shelter, as James alluded, I use a Zpacks tarp that weighs about 5 oz with guylines and a piece of polycryo as a groundsheet. The MLD Core backpack weighs about 11 oz(with bottle holders), EE quilt is 11.6 oz in its stuff sack, Esbit cook kit 7.4 oz (kinda heavy, but that includes coffee cup and fuel). One thing I don’t compromise is my air mat, which is a Neoair Trekker torso/wide that weighs 15 oz, and an Exped pillow. Those items alone push me a bit past SUL, but I don’t care; no matter what, I need a good night’s sleep.
Photo of the zpacks “pocket tarp”