What are some popular brands for water bottles at REI?

The top brands for water bottles include: REI Co-op CamelBak Hydro Flask HydraPak YETI Browse our selection of top outdoor gear and apparel brands.

How can I earn a Co-op Member Reward on my water bottles purchase?

REI Co-op Members get 10% back annually on every eligible purchase, including most full-priced water bottles. (10% is typical but not guaranteed.) To earn or redeem rewards, buy a one-time $30 lifetime membership, or sign in as a member. See details about the Co-op Member Reward .

How much do water bottles cost?

At REI Co-op, we carry a wide range of water bottles starting around $50 with some higher-end brands and models costing over $100.

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Water Bottles

(161 products)

Products (161)

Sort: Best Match

Staff Pick
REI Co-opSwiftland Handheld Water Bottle - 14 fl. oz.
$44.95
26 reviews with an average rating of 4.6 out of 5 stars
Liquid Capacity:
14 fl. oz.
Cap Type:
Screw Cap
Bottle Opening:
Medium
Add Swiftland Handheld Water Bottle - 14 fl. oz. to Compare
CamelBakPodium Steel VSS Insulated Water Bottle - 18 fl. oz.
$39.00
49 reviews with an average rating of 4.2 out of 5 stars
Liquid Capacity:
18 fl. oz.
Cap Type:
Push/Pull
Bottle Opening:
Medium
Features:
Insulated
Add Podium Steel VSS Insulated Water Bottle - 18 fl. oz. to Compare
LifeStrawGo Series 1 L Water Filter Bottle - 33.8 fl. oz.
$49.95
82 reviews with an average rating of 4.1 out of 5 stars
Filter Type:
Bottle
Best Use:
Travel, Hiking
Removes/Destroys:
Protozoa And Bacteria
Weight:
9.4 ounces
Add Go Series 1 L Water Filter Bottle - 33.8 fl. oz. to Compare
CamelBakFit Cap Insulated Stainless-Steel Water Bottle - 25 fl. oz.
$20.73
Save 30%
compared to $30.00
0 reviews
Liquid Capacity:
25 fl. oz.
Cap Type:
Screw Cap
Bottle Opening:
Wide
Features:
Insulated
Add Fit Cap Insulated Stainless-Steel Water Bottle - 25 fl. oz. to Compare
REI OUTLET
HydraPakUltraFlask Speed 500 ml Water Bottle - 17 fl. oz.
$22.00
2 reviews with an average rating of 4.0 out of 5 stars
Liquid Capacity:
17 fl. oz.
Cap Type:
Flip Top, Push/Pull
Bottle Opening:
Medium
Add UltraFlask Speed 500 ml Water Bottle - 17 fl. oz. to Compare
Hydro FlaskTravel Vacuum Mug with Flip Sip Cap - 20 fl. oz.
$34.95
3 reviews with an average rating of 4.0 out of 5 stars
Liquid Capacity:
20 fl. oz.
Cap Type:
Flip Top
Bottle Opening:
Wide
Features:
Insulated
Add Travel Vacuum Mug with Flip Sip Cap - 20 fl. oz. to Compare
Co-op CyclesPurist Water Bottle - 22 fl. oz.
$10.95
134 reviews with an average rating of 4.3 out of 5 stars
Liquid Capacity:
22 fl. oz.
Cap Type:
Push/Pull
Bottle Opening:
Wide
Add Purist Water Bottle - 22 fl. oz. to Compare
Top Rated
HydraPakSkyFlask Speed 500 ml Water Bottle - 17 fl. oz.
$33.00
17 reviews with an average rating of 4.5 out of 5 stars
Liquid Capacity:
17 fl. oz.
Cap Type:
Flip Top, Push/Pull
Bottle Opening:
Medium
Add SkyFlask Speed 500 ml Water Bottle - 17 fl. oz. to Compare
CamelBakPodium Chill Insulated Water Bottle - 21 fl. oz.
$18.00 - $20.00
170 reviews with an average rating of 4.0 out of 5 stars
Liquid Capacity:
21 fl. oz.
Cap Type:
Squeeze
Bottle Opening:
Wide
Features:
Insulated
Add Podium Chill Insulated Water Bottle - 21 fl. oz. to Compare
Co-op CyclesInsulated Water Bottle - 23 fl. oz.
$17.95
60 reviews with an average rating of 4.3 out of 5 stars
Liquid Capacity:
23 fl. oz.
Cap Type:
Push/Pull
Bottle Opening:
Wide
Features:
Insulated
Add Insulated Water Bottle - 23 fl. oz. to Compare
CamelBakPodium Titanium Insulated Water Bottle - 18 fl. oz.
$100.00
31 reviews with an average rating of 4.1 out of 5 stars
Liquid Capacity:
18 fl. oz.
Cap Type:
Push/Pull
Bottle Opening:
Medium
Features:
Insulated
Add Podium Titanium Insulated Water Bottle - 18 fl. oz. to Compare
Top Rated
CamelBakThrive Chug Water Bottle - 50 fl. oz.
$21.00
7 reviews with an average rating of 5.0 out of 5 stars
Liquid Capacity:
50 fl. oz.
Cap Type:
Flip Top
Bottle Opening:
Medium
Add Thrive Chug Water Bottle - 50 fl. oz. to Compare
CamelBakPeak Fitness Chill Insulated Water Bottle - 17 fl. oz.
$9.73
Save 35%
compared to $15.00
5 reviews with an average rating of 2.0 out of 5 stars
Liquid Capacity:
17 fl. oz.
Cap Type:
Flip Top
Bottle Opening:
Wide
Features:
Insulated
Add Peak Fitness Chill Insulated Water Bottle - 17 fl. oz. to Compare
REI OUTLET
HydraPakFlux Water Bottle - 25 fl. oz.
$27.00
15 reviews with an average rating of 4.3 out of 5 stars
Liquid Capacity:
25 fl. oz.
Cap Type:
Squeeze
Bottle Opening:
Narrow
Add Flux Water Bottle - 25 fl. oz. to Compare
REI Co-opNalgene Sustain Camp Monsters Wide-Mouth Water Bottle - 32 fl. oz.
$17.00
3 reviews with an average rating of 5.0 out of 5 stars
Liquid Capacity:
32 fl. oz.
Cap Type:
Screw Cap
Bottle Opening:
Wide
Add Nalgene Sustain Camp Monsters Wide-Mouth Water Bottle - 32 fl. oz. to Compare
Top Rated
KatadynBeFree AC Water Filter Bottle 0.7 L
$49.95
68 reviews with an average rating of 4.7 out of 5 stars
Filter Type:
Bottle
Best Use:
Backpacking, Travel, Hiking
Removes/Destroys:
Protozoa And Bacteria
Weight:
3.28 ounces
Add BeFree AC Water Filter Bottle 0.7 L to Compare
Top Rated
BOTEMAGNEBottle - 36 fl. oz.
$70.00
131 reviews with an average rating of 4.9 out of 5 stars
Liquid Capacity:
36 fl. oz.
Cap Type:
Screw Cap
Bottle Opening:
Wide
Features:
Insulated
Add MAGNEBottle - 36 fl. oz. to Compare
AmphipodHydraform Minimalist Handheld Water Bottle - 20 fl. oz.
$24.95
40 reviews with an average rating of 4.4 out of 5 stars
Add Hydraform Minimalist Handheld Water Bottle - 20 fl. oz. to Compare
Hydro FlaskWide-Mouth Vacuum Water Bottle with Flex Straw Cap - 40 fl. oz.
$34.73
Save 30%
compared to $49.95
1 reviews with an average rating of 5.0 out of 5 stars
Liquid Capacity:
40 fl. oz.
Cap Type:
Lid With Straw
Bottle Opening:
Wide
Features:
Insulated
Add Wide-Mouth Vacuum Water Bottle with Flex Straw Cap - 40 fl. oz. to Compare
REI OUTLET
HydraPakFlux Water Bottle - 50 fl. oz.
$32.00
16 reviews with an average rating of 4.4 out of 5 stars
Liquid Capacity:
50 fl. oz.
Cap Type:
Squeeze
Bottle Opening:
Narrow
Add Flux Water Bottle - 50 fl. oz. to Compare
Top Rated
BivoTrio Insulated Water Bottle - 17 fl. oz.
$44.00
11 reviews with an average rating of 4.8 out of 5 stars
Liquid Capacity:
17 fl. oz.
Cap Type:
Push/Pull
Bottle Opening:
Medium
Features:
Insulated
Add Trio Insulated Water Bottle - 17 fl. oz. to Compare
SalomonSoft Flask Ultra 500 ml Water Bottle - 17 fl. oz.
$28.00
18 reviews with an average rating of 4.1 out of 5 stars
Liquid Capacity:
17 fl. oz.
Cap Type:
Squeeze
Bottle Opening:
Wide
Add Soft Flask Ultra 500 ml Water Bottle - 17 fl. oz. to Compare
Top Rated
HydraPakPackFlask Filter Kit - 750 ml
$72.00
6 reviews with an average rating of 5.0 out of 5 stars
Filter Type:
Bottle, Squeeze
Best Use:
Trail Running, Backpacking
Removes/Destroys:
Protozoa And Bacteria
Weight:
4.1 ounces
Add PackFlask Filter Kit - 750 ml to Compare
REI Co-opNalgene Sustain Camp Monsters Wide-Mouth Water Bottle - 16 fl. oz.
$15.00
2 reviews with an average rating of 5.0 out of 5 stars
Liquid Capacity:
16 fl. oz.
Cap Type:
Screw Cap
Bottle Opening:
Wide
Add Nalgene Sustain Camp Monsters Wide-Mouth Water Bottle - 16 fl. oz. to Compare
CamelBakThrive Chug Water Bottle - 32 fl. oz.
$19.00
7 reviews with an average rating of 4.4 out of 5 stars
Liquid Capacity:
32 fl. oz.
Cap Type:
Flip Top
Bottle Opening:
Medium
Add Thrive Chug Water Bottle - 32 fl. oz. to Compare
Portland Design WorksPurist Water Bottle - 26 fl. oz.
$15.95
20 reviews with an average rating of 3.9 out of 5 stars
Liquid Capacity:
26 fl. oz.
Cap Type:
Push/Pull
Bottle Opening:
Wide
Add Purist Water Bottle - 26 fl. oz. to Compare
Ocean BottlePeak GO Vacuum Water Bottle with Straw Lid - 24 fl. oz.
$42.00
12 reviews with an average rating of 3.2 out of 5 stars
Liquid Capacity:
24 fl. oz.
Cap Type:
Lid With Straw
Bottle Opening:
Wide
Features:
Insulated
Add Peak GO Vacuum Water Bottle with Straw Lid - 24 fl. oz. to Compare
Top Rated
REI Co-opNalgene Sustain Logo Narrow-Mouth Water Bottle - 32 fl. oz.
$17.00
24 reviews with an average rating of 4.7 out of 5 stars
Liquid Capacity:
32 fl. oz.
Cap Type:
Screw Cap
Bottle Opening:
Narrow
Add Nalgene Sustain Logo Narrow-Mouth Water Bottle - 32 fl. oz. to Compare
Klean KanteenRise Classic Insulated Water Bottle with Flip Seal Sport Cap - 16 fl. oz.
$30.95
4 reviews with an average rating of 4.0 out of 5 stars
Liquid Capacity:
16 fl. oz.
Cap Type:
Lid With Straw
Bottle Opening:
Narrow
Features:
Insulated
Add Rise Classic Insulated Water Bottle with Flip Seal Sport Cap - 16 fl. oz. to Compare
Top Rated
Hydro FlaskKids' Wide-Mouth Vacuum Water Bottle with Straw Cap and Bottle Boot - 18 fl. oz.
$34.95
1130 reviews with an average rating of 4.6 out of 5 stars
Liquid Capacity:
18 fl. oz.
Cap Type:
Lid With Straw
Bottle Opening:
Wide
Features:
Insulated
Add Kids' Wide-Mouth Vacuum Water Bottle with Straw Cap and Bottle Boot - 18 fl. oz. to Compare
NathanSpeedDraw 2.0 Insulated Flask - 12 fl. oz.
$38.00
18 reviews with an average rating of 4.4 out of 5 stars
Liquid Capacity:
12 fl. oz.
Cap Type:
Push/Pull
Bottle Opening:
Medium
Features:
Insulated
Add SpeedDraw 2.0 Insulated Flask - 12 fl. oz. to Compare
BivoDuo Non-Insulated Water Bottle - 25 fl. oz.
$44.00
6 reviews with an average rating of 3.8 out of 5 stars
Liquid Capacity:
25 fl. oz.
Cap Type:
Push/Pull
Bottle Opening:
Medium
Add Duo Non-Insulated Water Bottle - 25 fl. oz. to Compare
Top Rated
CamelBakPodium Water Bottle - 15 fl. oz.
$12.00
11 reviews with an average rating of 4.5 out of 5 stars
Liquid Capacity:
15 fl. oz.
Cap Type:
Squeeze
Bottle Opening:
Narrow
Add Podium Water Bottle - 15 fl. oz. to Compare
CamelBakThrive Flip Straw VSS Vacuum Water Bottle - 25 fl. oz.
$31.00
1 reviews with an average rating of 5.0 out of 5 stars
Liquid Capacity:
25 fl. oz.
Cap Type:
Lid With Straw
Bottle Opening:
Narrow
Features:
Insulated
Add Thrive Flip Straw VSS Vacuum Water Bottle - 25 fl. oz. to Compare
NathanSpeedDraw 2.0 Insulated Flask - 18 fl. oz.
$44.00
24 reviews with an average rating of 4.2 out of 5 stars
Liquid Capacity:
18 fl. oz.
Cap Type:
Push/Pull
Bottle Opening:
Medium
Features:
Insulated
Add SpeedDraw 2.0 Insulated Flask - 18 fl. oz. to Compare
JanjiMultihold Handheld Sleeve with Water Bottle
$35.93
Save 25%
compared to $48.00
0 reviews
Liquid Capacity:
17 fl. oz.
Cap Type:
Squeeze
Bottle Opening:
Narrow
Add Multihold Handheld Sleeve with Water Bottle to Compare
PlatypusDayCap In-Bottle Filter
$49.95
15 reviews with an average rating of 4.3 out of 5 stars
Filter Type:
Bottle
Best Use:
Travel, Backpacking, Hiking
Removes/Destroys:
Protozoa And Bacteria
Weight:
2.6 ounces
Add DayCap In-Bottle Filter to Compare
NathanQuickSqueeze Lite Water Bottle - 12 fl. oz.
$18.97
Save 32%
compared to $28.00
0 reviews
Liquid Capacity:
12 fl. oz.
Cap Type:
Push/Pull
Bottle Opening:
Narrow
Add QuickSqueeze Lite Water Bottle - 12 fl. oz. to Compare
REI OUTLET
Top Rated
YETIYonder Water Bottle with Yonder Chug Cap - 34 fl. oz.
$28.00
1612 reviews with an average rating of 4.7 out of 5 stars
Liquid Capacity:
34 fl. oz.
Cap Type:
Screw Cap
Bottle Opening:
Medium
Add Yonder Water Bottle with Yonder Chug Cap - 34 fl. oz. to Compare
CamelBakPodium Ice Insulated Water Bottle - 21 fl. oz.
$33.00
110 reviews with an average rating of 4.2 out of 5 stars
Liquid Capacity:
21 fl. oz.
Cap Type:
Squeeze
Bottle Opening:
Wide
Features:
Insulated
Add Podium Ice Insulated Water Bottle - 21 fl. oz. to Compare
FidlockTWIST 750 Compact Bottle and Bike Base
$55.00
1 reviews with an average rating of 5.0 out of 5 stars
Add TWIST 750 Compact Bottle and Bike Base to Compare
NathanSpeedDraw 2.0 Handheld Water Bottle - 12 fl. oz.
$32.00
17 reviews with an average rating of 4.2 out of 5 stars
Liquid Capacity:
12 fl. oz.
Cap Type:
Push/Pull
Bottle Opening:
Medium
Add SpeedDraw 2.0 Handheld Water Bottle - 12 fl. oz. to Compare
HydraPakSkyFlask Speed 350 ml Water Bottle - 12 fl. oz.
$31.00
2 reviews with an average rating of 5.0 out of 5 stars
Liquid Capacity:
12 fl. oz.
Cap Type:
Flip Top, Push/Pull
Bottle Opening:
Medium
Add SkyFlask Speed 350 ml Water Bottle - 12 fl. oz. to Compare
REI Co-opNalgene Sustain Pride Wide-Mouth Water Bottle - 32 fl. oz.
$17.00
0 reviews
Liquid Capacity:
32 fl. oz.
Cap Type:
Screw Cap
Bottle Opening:
Wide
Add Nalgene Sustain Pride Wide-Mouth Water Bottle - 32 fl. oz. to Compare
Top Rated
Hydro FlaskKids' Wide-Mouth Vacuum Water Bottle with Straw Cap and Bottle Boot - 12 fl. oz.
$29.95
1137 reviews with an average rating of 4.6 out of 5 stars
Liquid Capacity:
12 fl. oz.
Cap Type:
Lid With Straw
Bottle Opening:
Wide
Add Kids' Wide-Mouth Vacuum Water Bottle with Straw Cap and Bottle Boot - 12 fl. oz. to Compare
woomGLUG Stainless-Steel Water Bottle and Cage Set - Kids'
$24.00
23 reviews with an average rating of 3.8 out of 5 stars
Add GLUG Stainless-Steel Water Bottle and Cage Set - Kids' to Compare
Klean KanteenKids TKWide Insulated Water Bottle with Twist Cap - 12 fl. oz.
$30.95
5 reviews with an average rating of 2.2 out of 5 stars
Liquid Capacity:
12 fl. oz.
Cap Type:
Flip Top
Bottle Opening:
Wide
Features:
Insulated
Add Kids TKWide Insulated Water Bottle with Twist Cap - 12 fl. oz. to Compare
Top Rated
AmphipodHydraform Chiller Handheld Water Bottle - 20 fl. oz.
$40.00
6 reviews with an average rating of 4.5 out of 5 stars
Add Hydraform Chiller Handheld Water Bottle - 20 fl. oz. to Compare
KatadynBeFree AC Water Filter Bottle 0.9 L
$54.95
2 reviews with an average rating of 5.0 out of 5 stars
Filter Type:
Bottle
Best Use:
Backpacking, Travel, Hiking
Removes/Destroys:
Protozoa And Bacteria
Weight:
3.66 ounces
Add BeFree AC Water Filter Bottle 0.9 L to Compare
Ocean BottleGO Clear Water Bottle - 24 fl. oz.
$26.00
10 reviews with an average rating of 2.9 out of 5 stars
Liquid Capacity:
24 fl. oz.
Cap Type:
Lid With Straw
Bottle Opening:
Wide
Add GO Clear Water Bottle - 24 fl. oz. to Compare
Co-op CyclesPlant-Based Water Bottle - 600 ml
$13.95
13 reviews with an average rating of 3.5 out of 5 stars
Liquid Capacity:
20.3 fl. oz.
Cap Type:
Push/Pull
Bottle Opening:
Wide
Add Plant-Based Water Bottle - 600 ml to Compare
REI Co-opNalgene Sustain Pride Wide-Mouth Water Bottle - 16 fl. oz.
$15.00
1 reviews with an average rating of 4.0 out of 5 stars
Liquid Capacity:
16 fl. oz.
Cap Type:
Screw Cap
Bottle Opening:
Wide
Add Nalgene Sustain Pride Wide-Mouth Water Bottle - 16 fl. oz. to Compare
AmphipodHydraform Ergo-Lite Ultra Handheld Water Bottle - 20 fl. oz.
$40.00
20 reviews with an average rating of 3.9 out of 5 stars
Add Hydraform Ergo-Lite Ultra Handheld Water Bottle - 20 fl. oz. to Compare
AmphipodSoft-Tech Minimalist Soft Flask Handheld Water Bottle - 20 fl. oz.
$32.50
4 reviews with an average rating of 3.5 out of 5 stars
Liquid Capacity:
20 fl. oz.
Cap Type:
Push/Pull
Bottle Opening:
Medium
Add Soft-Tech Minimalist Soft Flask Handheld Water Bottle - 20 fl. oz. to Compare
HydraPakSkyFlask Speed IT 500 ml Water Bottle - 17 fl. oz.
$42.00
4 reviews with an average rating of 4.3 out of 5 stars
Liquid Capacity:
17 fl. oz.
Cap Type:
Screw Cap
Bottle Opening:
Medium
Features:
Insulated
Add SkyFlask Speed IT 500 ml Water Bottle - 17 fl. oz. to Compare
AmphipodHydraform Bottle with Jett-Lock - 20 fl. oz.
$12.50
7 reviews with an average rating of 2.9 out of 5 stars
Liquid Capacity:
20 fl. oz.
Cap Type:
Squeeze
Bottle Opening:
Wide
Add Hydraform Bottle with Jett-Lock - 20 fl. oz. to Compare
NathanHyperNight Pinnacle Soft Flask - 14 fl. oz.
$46.00
3 reviews with an average rating of 4.0 out of 5 stars
Liquid Capacity:
14 fl. oz.
Cap Type:
Squeeze
Bottle Opening:
Medium
Add HyperNight Pinnacle Soft Flask - 14 fl. oz. to Compare
NathanInsulated Soft Flask - 18 fl. oz.
$42.00
26 reviews with an average rating of 4.2 out of 5 stars
Liquid Capacity:
18 fl. oz.
Cap Type:
Squeeze
Bottle Opening:
Medium
Features:
Insulated
Add Insulated Soft Flask - 18 fl. oz. to Compare
AmphipodRunBright Soft-Tech Luxe Handheld Water Bottle - 16 fl. oz.
$40.00
0 reviews
Liquid Capacity:
16 fl. oz.
Cap Type:
Push/Pull
Bottle Opening:
Medium
Features:
Insulated
Add RunBright Soft-Tech Luxe Handheld Water Bottle - 16 fl. oz. to Compare
Top Rated
REI Co-opNalgene Sustain Original Logo Wide-Mouth Water Bottle - 32 fl. oz.
$17.00
19 reviews with an average rating of 4.9 out of 5 stars
Liquid Capacity:
32 fl. oz.
Cap Type:
Screw Cap
Bottle Opening:
Wide
Add Nalgene Sustain Original Logo Wide-Mouth Water Bottle - 32 fl. oz. to Compare
FidlockTWIST 590 Water Bottle and Bike Base
$50.00
0 reviews
Add TWIST 590 Water Bottle and Bike Base to Compare
New arrival
FidlockTWIST 600 Water Bottle and Bike Base
$45.00
0 reviews
Add TWIST 600 Water Bottle and Bike Base to Compare
CamelBakThrive Flip Straw Water Bottle - 32 fl. oz.
$19.00
6 reviews with an average rating of 3.8 out of 5 stars
Liquid Capacity:
32 fl. oz.
Cap Type:
Lid With Straw
Bottle Opening:
Narrow
Add Thrive Flip Straw Water Bottle - 32 fl. oz. to Compare
BromptonFidlock TWIST 600 Bottle with Universal Base
$71.50
0 reviews
Add Fidlock TWIST 600 Bottle with Universal Base to Compare
FidlockTWIST 450 Bottle and Universal Bike Base
$55.00
0 reviews
Add TWIST 450 Bottle and Universal Bike Base to Compare
AmphipodSoft-Tech Luxe Soft Flask Handheld Water Bottle - 16 fl. oz.
$40.00
2 reviews with an average rating of 1.5 out of 5 stars
Liquid Capacity:
16 fl. oz.
Cap Type:
Push/Pull
Bottle Opening:
Medium
Features:
Insulated
Add Soft-Tech Luxe Soft Flask Handheld Water Bottle - 16 fl. oz. to Compare
AmphipodHydraform Soft-Tech Insulluxe Handheld Water Bottle - 16 fl. oz.
$50.00
4 reviews with an average rating of 4.8 out of 5 stars
Add Hydraform Soft-Tech Insulluxe Handheld Water Bottle - 16 fl. oz. to Compare
FidlockTWIST 450 Water Bottle and Bike Base
$45.00
0 reviews
Add TWIST 450 Water Bottle and Bike Base to Compare
MSWWater Bottle and Cage Kit - Kids'
$15.00
12 reviews with an average rating of 3.1 out of 5 stars
Add Water Bottle and Cage Kit - Kids' to Compare
BromptonFidlock TWIST 600 Bottle with Bike Base
$60.50
1 reviews with an average rating of 5.0 out of 5 stars
Add Fidlock TWIST 600 Bottle with Bike Base to Compare
NathanQuickSqueeze Plus Insulated Handheld Water Bottle - 12 fl. oz.
$35.00
4 reviews with an average rating of 5.0 out of 5 stars
Liquid Capacity:
12 fl. oz.
Cap Type:
Push/Pull
Bottle Opening:
Medium
Features:
Insulated
Add QuickSqueeze Plus Insulated Handheld Water Bottle - 12 fl. oz. to Compare