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STRADA Easel
This lightweight black anodized aluminum easel folds down to a compact 24.8 allowing it to easily fit into backpack or bags and weighs a just a tad more than 3.5 lbs. You can set up on a table, for sitting or standing by adjusting legs from 24-66.14 by flipping up on the Sure-Lock height adjustment buttons. It will allow you to securely hold panels, canvas or pads from 2mm to 42mm (.08 to 1.63 thick) by using two very significant improvements to outdoor easels.
Soho Urban Artist Aluminum Art Easel & Carry Bag for Plein Air Painting - Lightweight Anodized Aluminum Compact Painting
MEEDEN Plein Air Painting Easel with Aluminum Travel Tripod and Nylon Carry Bag, Artist Pochade Box, Portable French Easel - AliExpress
Make your own Plein air box for less than £5