shoebox, suitcase, mailbox, bag, box, wrapper, postmark, drawer, wallet, addressee, briefcase, recycling bin, postcard, billfold, mailing, manilla, sender, bubble wrap, carton, duffle bag, satchel, postbox, wad, door, ballpoint pen, foolscap, pouch, duffel bag, valise, postage, plastic bag, knapsack, wastepaper basket, checkbook, backpack, notepaper, crate, stamp, photocopies, letterhead, unstamped, jar, tray, binder, glassine, counterfoil, packages, wicker basket, strongbox, mailroom, holdall, pigeonholes, folder, hatbox, cellophane, bankbook, lunchbox, tote bag, pencil, receipt, grease pencil, bookplate, wastebasket, postage stamp, duffel, mailer, paystub, greeting card, sleeve, fanny pack, flask, franking machine, frontiers, notepad, ziploc, bra, packet, foldover, bottle, booklets, inkpad, trunk, embosser, lockbox, moneybox, pocket, invoice, letters, teller, nozzle, triplicate, corkboard, bumf, napkin, dogtag, backspace, vial, drawstring bag, hatband, boundaries, typewriter, doorknob, envelopes, envelop, shell, canister, notebook, sheet, casing, rectangle, sack, paper, spool, bags, print, norm, binomial, census, consensus, consultative, convert, entropy, exponent, ff, graph, history, interval, limit, logit, lognormal, loss, markov, model, multinomial

window envelope

achlamydeous, address, atmosphere, calyx, chlamydeous, cocoon, corolla, direct, diskette, dumbly, electron tube, enclosure, enwrapped, flap, floppy, floppy disk, inclosure, included, letter bomb, mailing-card, notation, package bomb, parcel bomb, pay envelope, pay packet, planetary nebula, plum-yew, postal card, postcard, post card, re-address, rip, self-addressed, stamp, stuff, superscribe, thermionic tube, thermionic vacuum tube, thermionic valve, tube, unaddressed, unused, vacuum tube, virion, window, window envelope

balloon

bag, container, cover, covering, curve, curved shape, natural covering, operating capability, performance capability, wrap, wrapper, wrapping

gasbag