OK I'm assuming you mean gear for kayak self supported camping, not base-camp car camping while paddling daytrips.
The old standard for light/compressible/warm is duck down. Polys approach down for warmth but are bulkier. Protect your sleeping bag in a high quality drybag like SealLine or NRS, but realize that NO drybag keeps water out if totally immersed for any appreciable amount of time.
Sleeping pads range from the old standard Thermorest which I find overly bulky to the inflatable core insulated ones like BigAgnes which packs down to Nalgene bottle sixe. Newer designs are the Exped mats which get very good reviews but are very pricey.
If you want more room stay away from mummy style. In your area a 3-season rated bag is fine unless you are doing true winter camping. Same goes for tents. A flannel sheet inside or a designed sleeping bag layer will extend a 3-season bag somewhat.
Thermorest and Kelty both make compressible, fairly light camp pillows if you want/need one.
Tents - well here is the first thing about sizing LOL:
1 person - translation small, very small. OK if you don't move
around much while you sleep and have minimal gear.
Sierra Designs Cliplight is an example, MSR Zoid etc.
2 person - 1 person + his/her gear
3 person - 2 persons + their gear.
Tent features I like:
sil nylon for tent body - light, admits ambient light well
bathtub type floor - edges come well above ground keep you dry
Footprint - always use one, saves wear.
aircraft grade aluminum tent poles - very light, yet strong.
FULL tarp overhangs - esp in windy rainy weather. Having two is better than one. I store paddle gear (often wet) under one, and shoes, personal care kit, morning grab n go stuff under the other, leaving an interior for nice dry sleeping bag and land clothes.
If for two people, two exits so one person can enter/exit w/out climbing over the other one.
Side pockets for small things like keys, wallet etc. Gear loft or side hanging bag like the Marmot taco uses wasted space for more small gear storage.
BIG zipper pulls (so you can find them easily) that slide smoothly and are bright enough to contrast w. tent body.
Titanium stakes. Sand stakes where needed.
I've been camping for some 20 years, mostly base camping but much of what I use has adapted to kayak camping because I bought light, strong and compact:
North Face Blue Kazoo downbag (the original North Face, not the
cheap Chinese fakes circulating the interwebs)
Big Agnes insulated core inflatable pad
2-person tent: Eureka 2XT Mountain Pass - for solo trips
3 person tent (when I can split gear w. a partner) Marmot Hoot
Stakes: MSR Groundhog and Vargas titanium
the tents (both of which got awesome reviews and are timetested and proven in my own use) are unfortunatel no longer made which is why I listed features not brand names.
Go to some other outdoor sites and check reviews. Top tier names are Mountain Hardware, MSR, Marmot, Sierra Designs, to name some. Good middle tier are Eureka, Kelty and the REI Models which often go on sale and are excellent values. This is by no means an exhaustive list.
You really need to research for yourself and find the tent that best fits your intended use, your priorities and price range.