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ManufacturerProductCategoryMaterial BodyFrameWaterproofingWeight (g)Weight (oz)Capacity Main Body (L)Capacity Total (L)Max Load (lb)CostWAL - Weight Adjusted for Load$ per WALWAC - Weight Adjusted for Capacity$ per WACOther Ranking Methods --->Equal Weighted WAC*WAL$/WAC_WALJJ Regression
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3F ULTutor 38UltralightUHMWPE / Nylon / Cordura - 30DFrameless53018.7383822$8424.120.213.911.7219.016.040.156
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3F ULTutor 26UltralightUHMWPE / Nylon / Cordura - 30DFrameless40014.1262617$9423.522.115.414.4619.518.3-33.82
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3F ULTrajectory 35LightXpac / UHMWPERemovable plastic frame65022.9303528$13523.231.321.729.2522.430.3-215.828
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3F ULTrajectory 55UltralightXpac / UHMWPERemovable plastic frame90531.9505540$16222.636.718.129.3220.433.0-130.868
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3F ULYUE 45+10L XpacLightXpacAluminum alloy frame112939.8455545$22025.155.225.155.2025.155.2-439.858
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3F UL 40+16LightUHMWPE / Nylon / Cordura - 30DFrameless88031.0405626$6133.820.622.013.4227.917.0-275.848
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AtomAtom 40UltralightXpac - V07 (options)Frameless42014.8354020$24121.050.612.028.9216.539.899.162
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AtomAtom 35UltralightXpac - V07 (options)Frameless40014.1303520$22820.045.613.330.4016.738.034.172
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AtomThe NanuUltralightRobic Nylon - 210D Frameless38013.4253020$21119.040.115.232.0717.136.1-30.818
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AtomAtom 30UltralightXpac - V07 (options)Frameless38013.4253020$22119.042.015.233.5917.137.8-30.818
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AtomAtom+UltralightXpac - V07 (options)Removable Carbon Fiber Frame58020.5354030$31919.361.716.652.8618.057.3-60.838
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AtomThe Pinnacle 40LightRobic Nylon - 210D Removable Plastic+Alloy Frame80028.2354045$23417.841.622.953.4920.347.5-280.838
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AtomThe Mo 60UltralightXpac - V07 (options)Removable Plastic Frame90031.7556040$35022.578.816.457.2719.468.0-40.878
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AtomThe Pinnacle 30LightRobic Nylon - 210D Removable Plastic+Alloy Frame70024.7253045$21115.632.828.059.0821.846.0-350.818
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AtomThe Mo 50UltralightXpac - V07 (options)Removable Plastic Frame85030.0455040$33421.371.018.963.0920.167.0-160.858
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AtomThe Mo 40LightXpac - V07 (options)Removable Plastic Frame80028.2354040$31920.063.822.972.9121.468.4-280.838
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BerghausFastHike45LightRobic Nylon - 100D Removable aluminum alloy81028.6404530$17627.047.520.335.6423.641.6-205.848
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BonfusIterus 38UltralightDCF - 2.92oz/sqyd with OptionsFramelessWaterproof2659.3303822$24512.029.58.821.6410.425.6169.172
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BonfusSaccus 48UltralightDCF - 2.92oz/sqyd with OptionsFramelessWaterproof35012.3404822$27515.943.88.824.0612.333.9254.152
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Chicken Tramper Ultralight GearCTUG-45LightXpac - VX21Removable Carbon Fiber Frame85030.0404535$28524.369.221.360.5622.864.9-245.848
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Chicken Tramper Ultralight GearCTUG-35LightXpac - VX21Removable Carbon Fiber Frame82229.0303535$27523.564.627.475.3525.470.0-387.828
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CotopaxiLuzon 24LUltralightNylonFrameless40814.4222420$7520.415.318.513.9119.514.6-109.812
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DeuterGravity Expedition 45+LightPolyamide - 100DDelrin frame87030.7404535$14024.934.821.830.4523.332.6-265.848
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DeuterAir Contact Lite 32NormalPolyamide - 210DDelrin frame101035.6283235$11028.931.736.139.6832.535.7-609.824
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DeuterSpeedlite 24NormalRobic Nylon - 100D Delrin frame77027.2202430$10525.727.038.540.4332.133.7-505.808
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DeuterSpeedlite 32NormalRobic Nylon - 100D Delrin frame87030.7283235$14024.934.831.143.5028.039.2-469.824
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DeuterSpeedlite 26NormalRobic Nylon - 100D Delrin frame83029.3222630$12027.733.237.745.2732.739.2-531.812
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DeuterGuide Light 30+NormalPolyamide - 100DDelrin frame90031.7263045$15020.030.034.651.9227.341.0-533.82
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DeuterAir Contact Lite 40+10HeavyPolyester - 600DDelrin frame168059.3364035$13048.062.446.760.6747.361.5-1143.84
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DeuterGuide 44+NormalPolyamide - 330DDelrin frame145051.1404445$18032.258.036.365.2534.261.6-845.848
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DeuterGuide 34+HeavyPolyamide - 330DDelrin frame133046.9303445$16529.648.844.373.1536.961.0-895.828
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DeuterFutura Pro 40HeavyPolyester - 600DDelrin frame162057.1364045$18036.064.845.081.0040.572.9-1083.84
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DeuterFutura 26HeavyPolyester - 600DDelrin frame140049.4222635$14040.056.063.689.0951.872.5-1101.812
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DurstonDD40LightXpac - V07/21 Removable aluminum alloy89031.4364040$15022.333.424.737.0823.535.2-353.84
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DurstonKakwa 40Ultralight
"Ultra 200" - Laminated Dyneema UHMWPE (3.5oz/yd)
Removable Aluminum alloyWaterproof77527.3415645$25017.243.118.947.2618.145.2-153.85
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ExpedLightning 60UltralightHDPE Gridstop 210D Removable aluminum alloy115040.6586053$17121.737.119.833.9120.835.5-239.884
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ExpedLightning 45LightHDPE Gridstop 210D Removable aluminum alloy113139.9434553$20021.342.726.352.6023.847.6-475.854
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Gossamer GearMurmurUltralightRobic Nylon - 30/70D Frameless35412.5283620$15917.728.112.620.1015.224.146.176
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Gossamer GearKumoUltralightRobic Nylon - 70D Frameless43115.2283620$16521.635.615.425.4018.530.5-30.824
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Gossamer GearG4-20LightRobic Nylon - 70/100DFrameless61521.7304225$18024.644.320.536.9022.640.6-180.828
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Gossamer GearMariposaLightRobic Nylon - 100/200D Removable internal86530.5366035$27024.766.724.064.8824.465.8-328.84
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Gossamer GearGorillaNormalRobic Nylon - 70D Removable internal86530.5294030$24028.869.230.072.0829.470.6-451.2256
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Granite GearVirga 2UltralightCordura - 100D Frameless53919.0505420$14027.037.710.815.0918.926.4235.132
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Granite GearVirga 26UltralightCordura - 100D Frameless45316.0263020$12022.727.217.420.9120.024.0-86.82
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Granite GearCrown2 38 (no lid)LightCordura - 100D Removable plastic83629.5384235$10023.923.922.022.0022.922.9-265.844
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Granite GearCrown2 60 (no lid)UltralightRobic Nylon - 100D Removable plastic99735.2606435$20028.557.016.633.2322.645.1-52.888
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Granite GearDaggerNormalRobic Nylon - 100D Frameless68024.0202225$10027.227.234.034.0030.630.6-415.808
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Granite GearBlazeLightRobic Nylon - 100D Removable plastic136048.0566050$27027.273.424.365.5725.769.5-483.88
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GregoryParagon 38NormalRobic Nylon - 210DAlloy Frame125044.1353540$12031.337.535.742.8633.540.2-730.838
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GregoryOptic 48LightRobic Nylon - 100D Alloy Frame110238.9484830$19036.769.823.043.6229.856.7-361.864
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GregoryStout 35NormalRobic Nylon - 210DAlloy Frame127044.8353535$15036.354.436.354.4336.354.4-750.838
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GregoryZulu 40NormalRobic Nylon - 210DAlloy Frame132046.6383835$18037.767.934.762.5336.265.2-749.844
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HanchorMARLLightXpac - VX21Removable aluminum alloy105337.1505144$27823.966.521.359.1422.662.8-287.367
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HMG - Hyperlite Mountain GearSouthwest 2400 (White, No Frame)UltralightDCF - 3.5oz/sqydFrameless73225.8405025$31029.390.818.356.7323.873.7-127.848
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HMG - Hyperlite Mountain GearSouthwest 3400 (White)UltralightDCF - 3.5oz/sqydRemovable aluminum alloy91032.1556540$36522.883.016.560.3919.671.7-50.878
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HMG - Hyperlite Mountain GearSouthwest 4400UltralightDCF - 5oz/sqydRemovable aluminum alloy + plastic frame111539.3708060$38018.670.615.960.5317.365.6-0.908
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HMG - Hyperlite Mountain GearSouthwest 2400 (Black, No Frame)UltralightDCF - 5oz/sqydFrameless79728.1405025$33031.9105.219.965.7525.985.5-192.848
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HMG - Hyperlite Mountain GearSouthwest 3400 (Black)UltralightDCF - 5oz/sqydRemovable aluminum alloy99135.0556540$36524.890.418.065.7721.478.1-131.878
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HMG - Hyperlite Mountain GearSouthwest 2400 (White)LightDCF - 3.5oz/sqydRemovable aluminum alloy85230.1405040$31021.366.021.366.0321.366.0-247.848
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HMG - Hyperlite Mountain GearSouthwest 2400 (Black)LightDCF - 5oz/sqydRemovable aluminum alloy91732.3405040$33022.975.722.975.6522.975.7-312.848
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HuckepacksPhoenixUltralightDX 210d RipStopFrameless46616.4305020$28023.365.215.543.4919.454.4-31.828
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KS UltralightKS60UltralightXpac - V07/21 with OptionsFrameless51018.0455820$17025.543.411.319.2718.431.3179.142
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KS UltralightKS50UltralightXpac - V07/21 with OptionsFrameless48016.9364820$16824.040.313.322.4018.731.456.16
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KS UltralightKS60 (with frame)UltralightXpac - V07/21 with ext collarRemovable aluminum alloy58420.6455826$21522.548.313.027.9017.738.1105.142
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KS UltralightKS40UltralightXpac - V07/21 with OptionsFrameless46016.2273820$16523.038.017.028.1120.033.0-76.822
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KS UltralightKS50 (with frame)UltralightXpac - V07/21 with ext collarRemovable aluminum alloy55419.5364826$21321.345.415.432.7818.339.1-17.84
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KS UltralightKS30LightXpac - V07/21 with OptionsFrameless44015.5182820$16122.035.424.439.3623.237.4-209.804
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KS UltralightKS40 (with frame)UltralightXpac - V07/21 with ext collarRemovable aluminum alloy53418.8273826$21020.543.119.841.5320.242.3-150.822
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KS UltralightKS30 (with frame)LightXpac - V07/21 with ext collarRemovable aluminum alloy51418.1182826$20619.840.728.658.8224.249.8-283.804
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LiteAFCurve 30UltralightDCF - 2.92oz/sqydFramelessWaterproof42515.0304020$22521.347.814.231.8817.739.89.172
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LiteAFCurve Fast Track 35UltralightDCF - 2.92oz/sqydFramelessWaterproof45316.0354520$30022.768.012.938.8317.853.466.162
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LiteAFCurve Full Suspension 40LightDCF - 2.92oz/sqydRemovable aluminum alloyWaterproof80728.5405535$31523.172.620.263.5521.668.1-202.848
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LitewayGramless XpacUltralightXpacFrameless39013.8283526$16215.024.313.922.5614.523.410.176
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LitewayElementumUltralightHDPE Gridstop 210D Frameless50017.6354826$20919.240.214.329.8616.835.019.162
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LitewayElementum XpacUltralightXpacFrameless50017.6354826$20919.240.214.329.8616.835.019.162
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LitewayElementum DCFUltralightDCF - 2.92oz/sqydFramelessWaterproof40014.1354826$29115.444.811.433.2613.439.0119.162
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MatadorFreerain 24UltralightCordura - 30DFramelessWaterproof1876.6222418$6510.46.88.55.539.46.1111.188
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MatadorFreerain 32UltralightCordura - 30DFramelessWaterproof30010.6303218$9016.715.010.09.0013.312.0134.172
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MLD - Mountain Laurel DesignsCoreUltralightDX 210d RipStopFrameless2127.5252520$10510.611.18.58.909.510.0137.182
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MLD - Mountain Laurel DesignsExodusUltralightDX 210d RipStopFrameless51018.0405825$23520.447.912.829.9616.639.094.152
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MLD - Mountain Laurel DesignsProphetUltralightDX 210d RipStopFrameless48217.0324825$23019.344.315.134.6417.239.5-13.832
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MLD - Mountain Laurel DesignsExodus DCFUltralightDCF - 3oz/5oz/sqydFramelessWaterproof51018.0405825$29020.459.212.836.9816.648.194.152
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MLD - Mountain Laurel DesignsBurnUltralightDX 210d RipStopFrameless46716.5253825$22018.741.118.741.1018.741.1-117.818
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MLD - Mountain Laurel DesignsProphet DCFUltralightDCF - 3oz/5oz/sqydFramelessWaterproof48217.0324825$28519.354.915.142.9317.248.9-13.832
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MLD - Mountain Laurel DesignsBurn DCFUltralightDCF - 3oz/5oz/sqydFramelessWaterproof46716.5253825$27518.751.418.751.3718.751.4-117.818
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Nashville PacksThe CutawayUltralightLS07 with OptionsFrameless42515.0284025$24017.040.815.236.4316.138.6-24.824
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Nashville PacksThe Cutaway DCFUltralightDCF - 2.92oz/sqydFramelessWaterproof41714.7284025$26516.744.214.939.4715.841.8-16.824
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Northern UltralightSundown (No Frame)UltralightXpac - V21 Frameless52618.6364620$26726.370.214.639.0120.554.610.16
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Northern UltralightSundownLightXpac - V21 Removable aluminum alloy74226.2364635$26721.256.620.655.0320.955.8-205.84
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OspreyHikelite 32LightRobic Nylon - 100D Aluminum alloy frame79828.1303230$11026.629.326.629.2626.629.3-363.828
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OspreyHikelite 26NormalRobic Nylon - 100D Aluminum alloy frame73025.8242620$10036.536.530.430.4233.533.5-397.816
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OspreyLevity 60UltralightCordura - 30D / UHMWPE Aluminum alloy frame88431.2556025$27035.495.516.143.4025.769.4-24.878
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OspreyExos 48LightRobic Nylon - 100D Aluminum alloy frame116541.1484840$20029.158.324.348.5426.753.4-424.864
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OspreyLevity 45LightCordura - 30D / UHMWPE Aluminum alloy frame84029.6404520$25042.0105.021.052.5031.578.8-235.848
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OspreyAura AG 50HeavyRobic Nylon - 100D Aluminum alloy frame185965.6455040$24046.5111.541.399.1543.9105.3-1169.858
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Pa'alante Ultralight Backpack V2UltralightXpac - V07/21 Frameless32911.6263018$22518.341.112.728.4715.534.837.18
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Pa'alante Lightweight Backpack V2UltralightXpac - V07/21 Frameless48117.0374018$24026.764.113.031.2019.947.772.158
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ParatusSpina 35NormalXpac - V21 Removable aluminum alloy109138.5354735$31031.296.631.296.6331.296.6-571.838
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RaywayBackpack Kit (you assemble)Ultralight????Frameless2809.9364018$8015.612.47.86.2211.79.3256.16